.ptx-content section .para.credit + .para.credit {
    margin-top: 0.25em;
}
.ptx-content section .para.credit > .title {
    font-weight: 700;
    margin-right: 0.5em;
}
/* .ptx-content section .para.credit > .title::after {
    content: ": ";
} */

.ptx-content section .para.copyright {
    margin-top: 2.5em;
}
.ptx-content section .para.license {
    margin-top: 2.5em;
}

/* stacked headings in the solutions backmatter */
.ptx-content section > .heading + .heading,
.ptx-content section section > .heading + .heading {
    margin-top: 0.5em;
}
.ptx-content section.solutions > h3.heading,
.ptx-content section.solutions section > h3.heading {
    font-size: 1.6em;
}
.ptx-content section.solutions > h4.heading,
.ptx-content section.solutions section > h4.heading {
    font-size: 1.45em;
}
.ptx-content section.solutions > h5.heading,
.ptx-content section.solutions section > h5.heading {
    font-size: 1.35em;
}
.ptx-content section.solutions > h6.heading,
.ptx-content section.solutions section > h6.heading {
    font-size: 1.25em;
}

.ptx-content .bibitem + .bibentry {
    display: inline-block;
    width: 90%;
}
.ptx-content .bibitem {
    display: inline-block;
    vertical-align: top;
    width: 7%;
    margin-right: 0;
}

.ptx-content figcaption {
    font-weight: normal;
}

.ptx-content figcaption {
    margin-top: 0.6em;
    margin-left: auto;
    margin-right: auto;
/*  Commenting this out because the initial letter of some captions were cut off
    text-indent: -30px;
*/
}

.ptx-content figure.table-like figcaption:first-child {
    font-style: oblique;
    margin-top: 0;
}
.ptx-content figure.table-like figcaption:first-child .type,
.ptx-content figure.table-like figcaption:first-child .codenumber {
    font-style: normal;
}

.ptx-content section figcaption .codenumber,
.ptx-content section figcaption .type {
    font-weight: 700;
    font-size: inherit;
}

.ptx-content figcaption .codenumber:after {
    content: "\2002";
}
.ptx-content figcaption .type:last-of-type::after {
   /* so, not followed by a span.codenumber */
   /* not sure where this is used */
    content: "\2002";
}

.ptx-content figcaption code.code-inline {
    white-space: pre;
}

.ptx-content figure > figcaption:first-child {
    margin-top: 1.5em;
}

.ptx-content figcaption + .named-list-content {
    margin-top: 0.6em;
}
.ptx-content figcaption + .named-list-content > .introduction > .para:first-child {
    margin-top: 0;
}
.ptx-content figcaption + table,
.ptx-content figcaption + .tabular-box {
    margin-top: 0.5em;
}

.ptx-content .definition-like .para > .emphasis {
    font-weight: 700;
}
.ptx-content em.alert {
    font-weight: bold;
}

.unprocessed {
    padding: 8px;
    background-color: rgb(255,230,230)
}

.unprocessed .unprocessed {
    margin: 8px;
    background-color: rgb(255,200,255)
}

.unprocessed .unprocessed .unprocessed {
    margin: 8px;
    background-color: rgb(205,205,255)
}

.ptx-content section.introduction + section {
    margin-top: 2em;
}

.ptx-content {
    margin: 0;
}

.ptx-content .runestone.parsons_section {
    display: inline-block;
    max-width: unset;
}

.ptx-content .runestone.ac_section {
    width: 60em;
    max-width: unset;
}
.ptx-content .runestone.ac_section .ac_section {
    max-width: unset;
}
.ptx-content .runestone.ac_section > div {
    max-width: unset;
}

.ptx-content .runestone > .parsons {
    width: 60em;
    max-width: unset;
}

.ptx-content .runestone .parsons {
    margin: 0;
}
.ptx-content .runestone.parsons_section > .parsons {
    width: max-content;
    padding-right: 1em;
}
.ptx-content .runestone .parsons .sortable-code-container {
    text-align: unset;
}
.ptx-content .runestone .parsons .parsons-text,
.ptx-content .runestone .parsons .parsons-controls {
    margin-left: 0;
    margin-right: 0;
}
.ptx-content .runestone .parsons .sortable-code + .sortable-code {
    margin-right: 0;
}

.ptx-content .runestone .parsons .runestone_caption_text {
    max-width: 660px;
}

.runestonebustmenu {
   position: absolute;
   right: 0;
   top: 0;
}
.runestonebustmenu .dropdown-content {
   position: absolute;
   right: 2em;
   left: unset;
   top: 1em;
}
@media screen and (max-width: 800px) {
/*
    .runestonebustmenu { display: none }
*/
    nav .dropdown .dropdown-content {
        top: unset;
        bottom: 36px;
    }

    .activecode-toggle { display: none }
}
/* above may be obsolete because we do not have the runestonebustmenu class in overhaul?
*/
.pretext .navbar .dropdown {
    height: 35px;
}

.ptx-content section section + section {
    margin-top: 3em;
}


.ptx-content .sidebyside > .para, .ptx-content .sidebyside > figure, .ptx-content .sidebyside > img, .ptx-content .sidebyside > table, .ptx-content .sidebyside > tabular, .ptx-content .sidebyside > section, .ptx-content .sidebyside > .paragraphs {
    display: inline-block;
    margin: 0;
}
.ptx-content .sidebyside .sbspanel > table {
/* see Sec 23.12 of sample article */
    overflow-x: auto;
    margin-left: auto;
    margin-right: auto;
}

.ptx-content .sidebyside figcaption {
    padding-left: 1em;
    padding-right: 0;
    padding-bottom: 0;
    margin: 0.75em 0 0 0;
}


.ptx-content figcaption {
    font-family: "PT Serif", "Times New Roman", Times, serif;
}

.ptx-content .sidebyside > .para {   /* what about sbspanel? */
    width: 32%;
    vertical-align: top;
}

.ptx-content .sidebyside > .para.left, .ptx-content .sidebyside > .para.middle, .ptx-content .sidebyside > .para.right {
    vertical-align: middle;
}

.ptx-content .sidebyside > .para + img {
    vertical-align: middle;
}

.ptx-content .sidebyside .sbsrow .sbsheader {
    margin-top: 0;
}

.ptx-content .sbsgroup {
    width: 100%;
}

.ptx-content .sidebyside {
    width: 100%;
}

.ptx-content .sbsrow {
    display: flex;
    justify-content: space-between;
}

/* Components of three types of "sbsrow" */

/* titles, totally centered text */
.ptx-content .sbsheader {
    text-align: center;
    justify-content: center;
    font-size: 1em;
}

.ptx-content .sbspanel:empty { /* can only happen when partially created */
    height: 10em;
    background-color: rgb(221, 221, 255);
}
/* containers of desired width for actual content */
.ptx-content .sbspanel {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}
.ptx-content .sbspanel.top {  /* also the default */
    justify-content: flex-start;
}
.ptx-content .sbspanel.middle {
    justify-content: center;  /* should that be space-between? */
}
.ptx-content .sbspanel.bottom {
    justify-content: flex-end;
}

.ptx-content .sbspanel > .para:first-child {
    margin-top: 0;
}

/* fixed-width items are centered horizontally in their panel */
/* always used in conjunction with sbspanel                   */
.ptx-content .fixed-width {
    align-items: center;
}

/* captions, centered until word-wrapped */
.ptx-content .sbscaption {
    justify-content: center;
}


/*  good for table, bad for image
.ptx-content .sidebyside {
    overflow-x: scroll;
}
*/

.ptx-content table {
    border-spacing: 0;
}

.ptx-content table {
    border-collapse: collapse;
}

.ptx-content .image-box + table,
.ptx-content .image-box + .sidebyside > .sbsrow:first-child > .sbspanel > table:first-child {
    margin-top: 1.5em;
}

.ptx-content table tr td,
.ptx-content table tr th {
    padding-top: 2px;
    padding-bottom: 2px;
    padding-left: 5px;
    padding-right: 5px;
}
.ptx-content table tr td {
    font-size: 90%;
}

.ptx-content table tr td.l {
    text-align: left;
}
.ptx-content table tr td.c {
    text-align: center;
}
.ptx-content table tr td.r {
    text-align: right;
}
.ptx-content table tr td.j {
    text-align: justify;
}
.ptx-content table tr td.lines {
        white-space: nowrap;
}


.ptx-content table tr td.t {
    vertical-align: top;
}
.ptx-content table tr td.b {
    vertical-align: bottom;
}
.ptx-content table tr td.m {
    vertical-align: middle;
}

.ptx-content table tr td.vv {
    border-left: 2px solid #000;
    border-right: 2px solid #000;
}

.ptx-content table tr td.vcv {
    border-left: 2px solid #000;
    border-right: 2px solid #000;
    text-align: center;
}

.ptx-content table tr td.vcvv {
    border-left: 2px solid #000;
    border-right: 4px solid #000;
    text-align: center;
}

.ptx-content table tr td.vlv {
    border-left: 2px solid #000;
    border-right: 2px solid #000;
    text-align: left;
}

.ptx-content table tr td.vrv {
    border-left: 2px solid #000;
    border-right: 2px solid #000;
    text-align: right;
}

.ptx-content table tr td.rv {
    border-right: 2px solid #000;
    text-align: right;
}

.ptx-content table tr td.vr {
    border-left: 2px solid #000;
    text-align: right;
}

.ptx-content table tr td.lv {
    border-right: 2px solid #000;
    text-align: left;
}

.ptx-content table tr td.vl {
    border-left: 2px solid #000;
    text-align: left;
}
.ptx-content table tr td.cv {
    border-right: 2px solid #000;
    text-align: center;
}

.ptx-content table tr td.Xv {
    border-right: 2px solid #000;
    text-align: left;
}

.ptx-content table tr td.vc {
    border-left: 2px solid #000;
    text-align: center;
}

.ptx-content table tr td.hline {
    padding: 0;
}

.ptx-content table tr td.hlinethick {

    padding-left: 0px;
    padding-right: 0px;

}

.ptx-content table tr td.hline hr  {

    margin-top:0;
    margin-bottom:0;
    margin-left: -1px;
    margin-right: -1px;
    border: 1px solid rgb(0,0,0);

}

.ptx-content table tr td.hlinethick hr  {

    margin-top:0;
    margin-bottom:0;
    margin-left: -1px;
    margin-right: -1px;
    border: 2px solid rgb(0,0,0);

}

.center table {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.ptx-content table tr th.b1,
.ptx-content table tr td.b1 {
    border-bottom: 1px solid #000;
}
.ptx-content table tr th.b2,
.ptx-content table tr td.b2 {
    border-bottom: 2px solid #000;
}
.ptx-content table tr th.b3,
.ptx-content table tr td.b3 {
    border-bottom: 3px solid #000;
}
.ptx-content table tr th.b0,
.ptx-content table tr td.b0 {
    border-bottom: none;
}

.ptx-content table tr th.t1,
.ptx-content table tr td.t1 {
    border-top: 1px solid #000;
}
.ptx-content table tr th.t2,
.ptx-content table tr td.t2 {
    border-top: 2px solid #000;
}
.ptx-content table tr th.t3,
.ptx-content table tr td.t3 {
    border-top: 3px solid #000;
}
.ptx-content table tr th.t0,
.ptx-content table tr td.t0 {
    border-top: none;
}

.ptx-content table tr th.r1,
.ptx-content table tr td.r1 {
    border-right: 1px solid #000;
}
.ptx-content table tr th.r2,
.ptx-content table tr td.r2 {
    border-right: 2px solid #000;
}
.ptx-content table tr th.r3,
.ptx-content table tr td.r3 {
    border-right: 3px solid #000;
}
.ptx-content table tr th.r0,
.ptx-content table tr td.r0 {
    border-right: none;
}

.ptx-content table tr th.l1,
.ptx-content table tr td.l1 {
    border-left: 1px solid #000;
}
.ptx-content table tr th.l2,
.ptx-content table tr td.l2 {
    border-left: 2px solid #000;
}
.ptx-content table tr th.l3,
.ptx-content table tr td.l3 {
    border-left: 3px solid #000;
}
.ptx-content table tr th.l0,
.ptx-content table tr td.l0 {
    border-left: none;
}

.ptx-content table tr td img {
    max-width: 200px;
    margin-right: 30px;
}

.ptx-content table.notation-list tr th {
    text-align: left;
}
.ptx-content table.notation-list tr td {
    text-align:left;
    vertical-align:top;
}
.ptx-content table.notation-list tr th {
    margin-left: 2em;
}
.ptx-content table.notation-list tr td {
    margin-left: 1em;
}

.ptx-content tr th.r0.l0,
.ptx-content tr td.r0.l0 {
    padding-left: 0.8em;
    padding-right: 0.8em;
}

.ptx-content table tr td span.decimal {
    float: left;
    text-align: right;
}

.ptx-content table tr.header-vertical th {
    writing-mode: vertical-rl;
    padding-left: 2em;
/*
    transform: rotate(180deg);
*/
}

.ptx-content table + article {
    margin-top: 1em;
}

.ptx-content .hidden-knowl-wrapper .hiddenproof,
.ptx-content .blob > article.hiddenproof,
.ptx-content section > article.hiddenproof  {
    margin-top: 0.3em;
}

.ptx-content .hidden-knowl-wrapper article {
    display: inline;
}

/* next disabled accidentally or on purpose? */
.apretext-content figure.figure-like {
    overflow: auto;
}
.ptx-content figure.figure-like {
    margin-left: 0;
    margin-right: 0;
}
.ptx-content figure.table-like {
    margin-left: 30px;
    margin-right: 30px;
}
.ptx-content figure.table-like.list {
    margin-right: 0;
}

/* why was this ever added ?
.ptx-content figure.figure-like figcaption {
    overflow: hidden;
}
*/

.ptx-content a > tt {
    font-size: 110%;
}

.ptx-content section .videolink a:link {
    background-size: 0;
}
.ptx-content .playvideo {
    cursor: pointer;
}

.ptx-content .videobig {
    padding-right: 0.3em;
    padding-left: 0.3em;
    font-size: 85%;
/*    background: #ffff66;
*/
    background-color: rgba(255,255,100,0.9);
    display: inline-block;
    position: relative;
    top: 100px;
    cursor: zoom-in;
}
.ptx-content .videobig.nofigure {
    /* not actually used */
}
.ptx-content .knowl .videobig {
    display: none;
}

.ptx-content .videosmall {
    padding-right: 0.3em;
    padding-left: 0.3em;
    font-size: 80%;
    background-color: rgba(255,255,100,0.9);
    display: inline-block;
    position: absolute;
    left: -250px;
    z-index: 1001;
    cursor: zoom-out;
}


.ptx-content .exercise-like ol li table {
    margin-bottom: 0.5em;
}

.ptx-content .exercise-like > ol li + li {
    margin-top: 0.5em;
}
.ptx-content .solution > ol li + li {
    margin-top: 0.5em;
}

/* should be the default
.ptx-content section.worksheet > .heading,
.ptx-content section section.worksheet > .heading,
.ptx-content section section section.worksheet > .heading {
  display: block;
}
*/
.ptx-content section.worksheet > .heading > .codenumber {
    display: inline-block;
    vertical-align: top;
}
.ptx-content section.worksheet > .heading > .title {
    display: inline-block;
    max-width: 70%;
}
.ptx-content .heading .print-links {
    display: inline-block;
    float: right;
    vertical-align: top;
    width: 19%;
    text-align: right;
}
.standalone .ptx-content .heading .print-links {
    display: none;
}
.standalone.worksheet .previous-button,
.standalone.worksheet .up-button,
.standalone.worksheet .next-button {
    display: none;
}
.standalone.worksheet .ptx-navbar .toc-toggle {
    display: none;
}
.standalone.worksheet .ptx-content [data-knowl]:hover,
.standalone.worksheet .ptx-content [data-knowl]:active,
.standalone.worksheet .ptx-content [data-knowl].active {
    background: none;
    color: black;
}
.standalone.worksheet .ptx-content [data-knowl]::after {
    border: none;
}
.standalone.worksheet .ptx-content .knowl-content {
    padding: 0;
}
.standalone.worksheet .ptx-content article > .knowl-output.original {
    margin: 0;
}

.ptx-content .appendix .heading > .type {
    display: inline;
}
.ptx-content .heading.hide-type > .type {
    display: none;
}

.ptx-content .heading .print-links > a {
    font-family: "Open Sans";
    font-size: 0.6em;
    font-weight: bold;
    padding: 0.1em 0.2em;
    background: #ffa;
    border: 2px solid green;
}
.ptx-content .heading .print-links > a.us {
    background: #eef;
    color: #9b1c2c;
    border-color: #041E42;
}
.ptx-content .heading .print-links > a + a {
    margin-left: 0.25em;
}

.ptx-content .autopermalink {
    position: absolute;
    display: inline-block;
    top: 3px;
    left: -1.9em;
    font-size: 85%;
    color: #a00;
    opacity: 0.05;
    margin-top: 0.1em;
}

.ptx-content li > .para > .autopermalink {
    left: -3.4em;
    top: 0;
}
.ptx-content .autopermalink a {
    color: #a00;
}
.ptx-content .autopermalink > * {
    padding-left: 0.2em;
    padding-right: 0.2em;
}
/* when jumping to a permalink, push down so sticky navbar does not cover */
:target {
    /* scroll-snap-margin-top: 45px;   for safari, except it doesn't work */
    scroll-margin-top: 45px;
}

.ptx-content .para > .autopermalink {
    margin-top: 0.2em;
}

.ptx-content .exercises > .autopermalink,
.ptx-content .introduction > .autopermalink,
.ptx-content .glossary > .autopermalink {
    margin-top: 0.3em;
/*
    margin-top: 1em;
*/
}
.ptx-content .appendix > .autopermalink,
.ptx-content .chapter > .autopermalink,
.ptx-content .index > .autopermalink,
.ptx-content .section > .autopermalink {
    margin-top: 0.3em;
/*
    margin-top: 2.7em;
*/
}
.ptx-content .subsection > .autopermalink,
.ptx-content .references > .autopermalink,
.ptx-content .exercises > .autopermalink {
    margin-top: 0.3em;
/*
    margin-top: 2.0em;
*/
}
.ptx-content .figure-like > .autopermalink {
    margin-top: 1.4em;
}

.ptx-content .subsubsection > .autopermalink {
    margin-top: 0;
}
.ptx-content .exercisegroup > .autopermalink {
/*
    margin-top: 0.3em;
*/
    margin-top: 1.4em;
}

.ptx-content .autopermalink:hover {
    opacity: 1;
    background: #eeddff;
}
.ptx-content .permalink-alert {
    position: absolute;
    top: -3em;
    left: 5em;
    padding: 1.5em 2em;
    background: #fff;
    border: 3px solid blue;
    z-index: 2001;
}

.navbar .indexnav {
    position: absolute;
    top: 46px;
    right: 0;
}
.mininav {
    float: left;
    padding-top: 0.7ex;
    padding-left: 1ex;
}

/* the index at the back of the book */

.indexjump {
    margin-left: 1.5ex;
    margin-top: 0.2ex;
    padding-top: 0;
    float: left;
    line-height: 0.95;
}

.indexjump a {
    padding-left: 2.5px;
    padding-right: 0.5px;
    width: 2.5ex;
/*
 *  *  omitted, because we put a space in the source
 *      padding-right: 3px;
 *      */
    margin-right: -1px;
    color: inherit;
    font-size: 80%;
    text-align: center;
}
.indexjump a::after{
    content: "";
    display: inline-block;
}
.indexjump a:nth-of-type(14){
    padding-left: 1.8ex;
}
.indexjump a:last-child {
    padding-right: 10px;
}

.indexjump a:hover {
    background: #eeaaff;
}

.ptx-content .indexitem {
    margin-top: 2px;
}

.ptx-content .subindexitem {
    margin-left: 2em;
    font-size: 95%;
    margin-top: -1px;
}

.ptx-content .subsubindexitem {
    margin-left: 3.5em;
    font-size: 95%;
    margin-top: -1px;
}

.ptx-content .indexknowl {
    margin-left: 0.11em;
}
.ptx-content em + .indexknowl  {
    margin-left: -0.25em;
}
.ptx-content .indexknowl a {
    margin-left: 2em;
}

.ptx-content .indexitem .see,
.ptx-content .subindexitem .see,
.ptx-content .subsubindexitem .see {
    margin-left: 1em;
    margin-right: 0;
}
.ptx-content .indexitem .seealso,
.ptx-content .subindexitem .seealso,
.ptx-content .subsubindexitem .seealso {
    margin-left: 1em;
    margin-right: 0;
}
.ptx-content .indexitem .see em,
.ptx-content .subindexitem .see em,
.ptx-content .subsubindexitem .see em,
.ptx-content .indexitem .seealso em,
.ptx-content .subindexitem .seealso em,
.ptx-content .subsubindexitem .seealso em {
    margin-right: 0.25em;
    font-style: italic;
}
/*  note that multiple things after "see" are in separate spans */
.ptx-content .indexitem .see + .see,
.ptx-content .subindexitem .see + .see,
.ptx-content .subsubindexitem .see + .see,
.ptx-content .indexitem .seealso + .seealso,
.ptx-content .subindexitem .seealso + .seealso,
.ptx-content .subsubindexitem .seealso + .seealso {
     margin-left: 0;
     margin-right: 0;
}

.ptx-content .indexitem .indexknowl {
    font-size: 90%;
}

.ptx-content .indexitem [data-knowl], .ptx-content .subindexitem [data-knowl], .ptx-content .indexitem [data-knowl]:hover {
    padding-right: 2px;
    padding-left: 2px;
}
.ptx-content .indexknowl [data-knowl]:hover, .ptx-content .indexknowl .active[data-knowl] {
    margin-left: 2em;
}

.ptx-content .subindexitem .indexknowl {
    font-size: 95%;
}
.ptx-content .subsubindexitem .indexknowl {
    font-size: 95%;
}

.ptx-content .indexletter {
    margin-top: 1.5em;
}

/* end index */

.ptx-content .hidden-knowl-wrapper .heading {
    display: inline;
}
.ptx-content .heading + .hidden-knowl-wrapper {
    display: inline;
}

.ptx-content .cols2 .knowl-output, .ptx-content .cols3 .knowl-output, .ptx-content .cols4 .knowl-output, .ptx-content .cols5 .knowl-output, .ptx-content .cols5 .knowl-output {
    width: 100%;
}

.ptx-content .cols2 + *, .ptx-content .cols3 + *, .ptx-content .cols4 + *, .ptx-content .cols5 + *, .ptx-content .cols6 + * {
    clear: both;
}
/* does the next line eliminate the need for the previous line? */
.ptx-content .cols2::after, .ptx-content .cols3::after, .ptx-content .cols4::after, .ptx-content .cols5::after, .ptx-content .cols6::after {
    content: "";
    display: block;
    clear: both;
}

.ptx-content section > ol:last-child,
.ptx-content section > ul:last-child {
    margin-bottom: 1.5em;
}
/* because of */
/* .ptx-content .colsN > li:last-child {
    padding-bottom: 1em;
}
*/
.ptx-content section > ol:last-child > li:last-child,
.ptx-content section > ul:last-child > li:last-child {
    padding-bottom: 0em;
}

/* does this do anything which is not accomplished by the colsN::after above? */
/* seems not
.ptx-content .cols2:last-child::after, .ptx-content .cols3:last-child::after, .ptx-content .cols4:last-child::after, .ptx-content .cols5:last-child::after, .ptx-content .cols6:last-child::after {
    content: "";
    display: block;
    clear: both;
}
*/

.ptx-content .cols2 > li:nth-child(2n+1),
.ptx-content .cols3 > li:nth-child(3n+1),
.ptx-content .cols4 > li:nth-child(4n+1),
.ptx-content .cols5 > li:nth-child(5n+1),
.ptx-content .cols6 > li:nth-child(6n+1) {
    clear: left;
}
/* need to repeat for .colsN */
.ptx-content .exercise-like ol.cols2 li {
    margin-top: 0.5em;
}

.ptx-content .cols2 > li,
.ptx-content .cols3 > li,
.ptx-content .cols4 > li,
.ptx-content .cols5 > li,
.ptx-content .cols6 > li {
    float: left;
}

.ptx-content .incontext {
    display: block;
    font-size: 85%;
    text-align: right;
}

.ptx-content .terminology {
  font-style: italic;
  font-weight: bold;
}

.ptx-content .emphasis {
    font-style: italic;
}
.ptx-content .emphasis .emphasis {
    font-weight: bold;
}

/* the "pink flash" when navigating to a target
*/
:target {
    animation: target-fade 15s 1;
}
@-webkit-keyframes target-fade {
    0% { background-color: rgba(120,0,120,.3); }
    100% { background-color: inherit;
           opacity: 1; }
}
@-moz-keyframes target-fade {
    0% { background-color: rgba(120,0,120,.3); }
    100% { background-color: inherit;
           opacity: 1; }
}


.ptx-content .autoterm [knowl], .ptx-content .autoterm [knowl]:after {
    font-weight: inherit;
    color: inherit;
    padding: 0;
    margin-bottom: inherit;
    border-bottom: inherit;
    border-bottom-color: inherit;
}

.ptx-content .autoterm [knowl]:hover {
    background: #ffddff;
    border-top: 2px dotted purple;
    border-bottom: 1px dotted red;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

.ptx-content ol li.custom-list-style-type {
    list-style-type: none;
}

.ptx-content ol li.custom-list-style-type:before {
     content: attr(label) "\00A0\00A0 ";
}

.ptx-content ol.no-marker,
.ptx-content ul.no-marker,
.ptx-content li.no-marker {
    list-style-type: none;
}

.ptx-content ol.decimal {
    list-style-type: decimal;
}
.ptx-content ol.lower-alpha {
    list-style-type: lower-alpha;
}
.ptx-content ol.upper-alpha {
    list-style-type: upper-alpha;
}
.ptx-content ol.lower-roman {
    list-style-type: lower-roman;
}
.ptx-content ol.upper-roman {
    list-style-type: upper-roman;
}
.ptx-content ul.disc {
    list-style-type: disc;
}
.ptx-content ul.square {
    list-style-type: square;
}
.ptx-content ul.circle {
    list-style-type: circle;
}
.ptx-content ol.no-marker,
.ptx-content ul.no-marker {
    list-style-type: none;
}

/* needed for dl, but probably won't cause harm elsewhere */
.ptx-content section,
.ptx-content article,
.ptx-content figure {
    clear: both;
}

/* dl is used for glossaries and descriptions lists.
   Glossaries are simple:  bold word by itself on a line.
        Definition indented on the next line.
        Vertical space before the next term.

   Description lists are more complicated.  The wider version
   (refering to the horizontal indentation of the definition;
    this is the default)
   has the (wrapped) term inline with the definition.

   The narrow version is complicated because the term is inline
   with its definition if it fits, otherwise it is on the line above.
   That means the vertical space between entries can't be handled by
   a top margin on the dt.  Instead we have an ::after on the dd .
 */

.ptx-content dl {
    margin-top: 1em;
    margin-left: 0;
    margin-bottom: 0;
    overflow: hidden;
}
.ptx-content dl dd {
    margin-top: 0;
}
.ptx-content dl dd::after {
  content: "";
  display: block;
  clear: both;
}
.ptx-content dl.glossary dt {
    margin-top: 1.25em;
}
.ptx-content dl.description-list dt,
.ptx-content dl.description-list dd {
    margin-top: 1em;
}
.ptx-content dl.description-list.narrow dt {
    margin-top: 0;
}
.ptx-content dl.glosary dt:first-of-type,
.ptx-content dl.description-list dt:first-of-type,
.ptx-content dl.glosary dd:first-of-type,
.ptx-content dl.description-list dd:first-of-type {
    margin-top: 0;
}
.ptx-content dl dd .para {
    margin-top: 1em;
}
.ptx-content dl dt > .para:first-child, .ptx-content dl dd > .para:first-child {
    margin-top: 0;
}


.ptx-content dl > dt {
    font-weight: bold;
    max-width: 55ex;
}

.ptx-content dl.description-list dt {
    float: left;
    clear: left;
    text-align: right;
    width: 18ex;
}
.ptx-content dl.description-list.narrow dt,
.ptx-content dl.glossary dt {
    text-align: left;
}
.ptx-content dl.glossary dd {
    margin-left: 5ex;
}
.ptx-content dl.description-list dd {
    margin-left: 22ex;
}
.ptx-content dl.description-list.narrow dd {
    margin-left: 12ex;
}
.ptx-content dl.description-list dt:first-of-type {
    clear: none;
}
.ptx-content dl.description-list.narrow dd::after {
    content: "";
    display: block;
    height: 1em;
    clear: left;
}
.ptx-content dl.description-list.narrow dd:last-child::after {
    height: 0;
}

.ptx-content dl.description-list dt {
    float: left;
    clear: both;
    margin-right: 1ex;
}
.ptx-content dl.description-list.narrow dt {
    width: unset;
    max-width: 55ex;
    text-align: left;
}
.ptx-content dl.description-list.narrow dd {
    margin-left: 0;
    margin-top: 0;
    width: 31em;
    max-width: calc(100% - 12ex);
    float: right;
    clear: right;
}

.ptx-content dl.description-list + * {
    clear: both;
}

@media screen and (max-width: 480px) {
  .ptx-content dl.description-list dt {
    float: none;
    margin-left: 0;
    text-align: left;
  }
  .ptx-content dl.description-list dd,
  .ptx-content dl.description-list.narrow dd {
    margin-top: 0.5em;
    margin-left: 3em;
    max-width: calc(100% - 3em);
  }
}
/* where do we have nested dl? */
.ptx-content dl.description-list dl dt {
    width: 8ex;
}
.ptx-content dl.description-list dd dd {
    margin-left: 18ex;
}
.ptx-content dl.description-list dl dd {
    margin-left: 12ex;
}
.ptx-content [data-knowl] > mjx-mrow .TEX-I {
    font-family: MJXZERO !important;
    font-style: normal !important;
}

/* remove this when MathJax fixes the bug that was setting the width to 0 */
/* as in  $x=0$.  becomes  $x=0\text{.}$ */
.ptx-content .knowl mjx-mtext > mjx-utext,
.ptx-content mjx-mtext > mjx-utext {
    width: revert !important;
}
.ptx-content mjx-msup mjx-utext,
.ptx-content mjx-msub mjx-utext {
    display: inline;
}

/* to stop things being blue when rendering MathJax with SVG */
a.mjx-svg-href  {
    fill: inherit;
    stroke: inherit;
}

.displaymath + .para {
    margin-top: 0
}

/* for long math formulas and tables to scroll on small screens */
@media screen and (max-width: 943px) {
  .ptx-content .displaymath {
     position: relative;
     overflow-x: auto;
  }
/* maybe the remainder of this case is subsumed by the above,
   and also does not apply to MJ3 */
  .ptx-content .mjx-chtml.MJXc-display {
    /*Allow users on smaller screens to scroll equations*/
    /*horizontally when they don't fit on the screen*/
    overflow-x: auto;
    overflow-y: hidden;
  }
  .ptx-content .figure-like {
    overflow-x: auto;
  }

  .ptx-content #MathJax_ZoomFrame {
    position: static;
    background: white;
  }
  .ptx-content #MathJax_Zoom {
    background-color: inherit;
    border: 0;
    padding: 0;
    position: absolute;
    overflow-x: auto;
    overflow-y: visible;
    left: 10% !important;
    max-height: none !important;
  }
}

/*  http://sites.wcsu.edu/mbxml/OER_Linear_Alg/glossary.html
   to fix the extra margin on top of the next term when
   the previous definition ends in display math
   May need to make less specific
*/
.ptx-content dd .displaymath:last-child .MJXc-display {
    margin-bottom: 0;
}

.floatnav {
    margin-top: 8px;
    margin-left: 50px;
}

.floatnav a {
    padding-left: 3px;
/*
 *  omitted, because we put a space in the source
    padding-right: 3px;
*/
    margin-right: -1px;
    color: inherit;
}

/* Example 4.8 of sample article (compare main page of sample book (4^{th} edition)`*/
.ptx-content a .heading .mjx-chtml {
    z-index: 1;
    background: #fff;
}
.ptx-content .hidden-knowl-wrapper [data-knowl]::after, .ptx-content .hidden-knowl-wrapper [data-knowl]:hover::after, .ptx-content .hidden-knowl-wrapper .active[data-knowl]::after {
    right: 7px;
}

.floatnav a:hover {
    background: #eeaaff;
}

.ptx-content .unselectable {  /* from Alex Jordan */
  user-select: none;           /* Non-prefixed version, currently
                                  not supported by any browser */
}

/* Adapted from William Hammond (attributed to David Carlisle) */
/* "mathjax-users" Google Group, 2015-12-27 */

.ptx-content .latex-logo {font-family: "PT Serif", "Times New Roman", Times, serif;}

.ptx-content .latex-logo .A {font-size: 75%; text-transform: uppercase; vertical-align: .5ex;
         margin-left: -.48em; margin-right: -.2em;}

.ptx-content .latex-logo .E {vertical-align:-.5ex; text-transform: uppercase;
         margin-left: -.18em; margin-right: -.12em; }

.ptx-content .fillin {
    display: inline-block;
    border-bottom-style: solid;
    border-width: 1px;
    margin-right: 0.1em;
    margin-bottom: -0.25em;
}
.ptx-content .fillin.underline {
    display: inline-block;
    border-bottom-style: solid;
    border-width: 1px;
    margin-right: 0.1em;
    margin-bottom: -0.25em;
}
.ptx-content .fillin.box {
    display: inline-block;
    border: none;
    margin-left: 0.1em;
    margin-right: 0.1em;
    margin-bottom: -0.25em;
    outline: 1px solid black;
    height: 1.3em;
}
.ptx-content .fillin.shade {
    display: inline-block;
    border: none;
    margin-right: 0.1em;
    margin-left: 0.1em;
    margin-bottom: -0.25em;
    background-color: #eee;
    height: 1.3em;
}


/*
 *  .hiddenproof
 */

/* knowlified proofs are in an article.hiddenproof */
/* .ptx-content .hiddenproof .heading,   ???? can't happen, because the a does the hiding? */
.ptx-content .hiddenproof > a > .heading {
    font-style: italic;
    font-weight: normal;
}

/* show wide equation overflow even when no scroll bars,
from Jiří Lebl */
.ptx-content .MJXc-display, .ptx-content .knowl-output .knowl-output .knowl-output .knowl-output .MJXc-display ,
.ptx-content pre.prettyprint,
.ptx-content pre.plainprint,
.ptx-content pre.console,
.ptx-content .code-box {
    background-image: linear-gradient(to right, white, white), linear-gradient(to right, white, white), linear-gradient(to right, rgba(0,0,0,.25), rgba(255,255,255,0)), linear-gradient(to left, rgba(0,0,0,.25), rgba(255,255,255,0));
    background-position: left center, right center, left center, right center;
    background-repeat: no-repeat;
    background-color: inherit;
    background-size: 20px 100%, 20px 100%, 10px 100%, 10px 100%;
    background-attachment: local, local, scroll, scroll;
}
.ptx-content .runestone .code-box {
    background-image: none;
}
.ptx-content .knowl-output .MJXc-display {
    background-image: linear-gradient(to right, var(--knowlbackground), var(--knowlbackground)), linear-gradient(to right, var(--knowlbackground), var(--knowlbackground)), linear-gradient(to right, rgba(0,0,0,.25), var(--knowlbackground)), linear-gradient(to left, rgba(0,0,0,.25), var(--knowlbackground));
}
/* this should have a variable name, maybe? */
.ptx-content .knowl-output.original .MJXc-display {
    background: inherit;
}

.ptx-content .assemblage-like .MJXc-display {
/*
    background-image: none;
    background-image: linear-gradient(to right, #f4f4fe, #f4f4fe), linear-gradient(to right, #f4f4fe, #f4f4fe), linear-gradient(to right, rgba(0,0,0,.25), rgba(242,242,254,0)), linear-gradient(to left, rgba(0,0,0,.25), rgba(242,242,254,0));
*/
    background-image: linear-gradient(to right, var(--assemblagebackground), var(--assemblagebackground)), linear-gradient(to right, var(--assemblagebackground), var(--assemblagebackground)), linear-gradient(to right, rgba(0,0,0,.25), var(--assemblagebackground)), linear-gradient(to left, rgba(0,0,0,.25), var(--assemblagebackground));
}


.ptx-content .knowl-output .knowl-output .MJXc-display {
    background-image: none;
    background-image: linear-gradient(to right, #fffff5, #fffff5), linear-gradient(to right, #fffff5, #fffff5), linear-gradient(to right, rgba(0,0,0,.25), rgba(255,255,243,0)), linear-gradient(to left, rgba(0,0,0,.25), rgba(255,255,243,0));
}
.ptx-content .knowl-output .knowl-output .knowl-output .MJXc-display {
    background-image: none;
    background-image: linear-gradient(to right, #fff5fe, #fff5fe), linear-gradient(to right, #fff5fe, #fff5fe), linear-gradient(to right, rgba(0,0,0,.25), rgba(255,243,254,0)), linear-gradient(to left, rgba(0,0,0,.25), rgba(255,243,254,0));
}



/* not sure where this was being used, but it made short knowls
 * look bad, like the hint here:
 * SAFurtherReading.html
*/
.ptx-content .knowl-output .knowl-content > *:last-child:not(.incontext) {
    margin-bottom: 0.5em;
}
.ptx-content .knowl-output .knowl .knowl-content > .solution-like,
.ptx-content .knowl-output .knowl .knowl-content > .solution-like:not(.incontext) {
    margin-bottom: 0.15em;
}
.ptx-content .knowl-output .knowl .knowl-content > .solution-like.hint {
    border-left: 1px solid #0f0;
    padding-left: 0.35em;
    background: #efe;
}
.ptx-content .knowl-output .knowl .knowl-content > .solution-like.answer {
    border-left: 2px solid #00f;
    padding-left: 0.35em;
    background: #eef;
}
.ptx-content .knowl-output .knowl .knowl-content > .solution-like.solution {
    border-left: 3px solid #c0c;
    padding-left: 0.5em;
    background: #fef;
}

.ptx-content .knowl-content > article:first-child,
.ptx-content .knowl-content > .solution-like:first-child {
/* padding, not margin, to get colored background (and not be absorbed) */
    padding-top: 0.25em;
}

.ptx-content .exercisegroup > .conclusion {
    margin-left: 1.5em;
}

.ptx-content .exercise-like .introduction {
    display: inline;
}
.ptx-content .exercise-like .introduction .heading {
    display: inline;
}
.ptx-content .exercise-like .introduction .para:first-child {
    display: inline;
}
.ptx-content .exercise-like .introduction::after {
    content: "";
    display: block;
}
.ptx-content .exercise-like .conclusion::before {
    content: "";
    display: block;
    margin-top: 0.25em;
}


/* if hints and solutions are in .posterior, then
 * some of the above styling does not apply */

.ptx-content article.exercise-like + .posterior {
    margin-top: -0.75em;
}


.ptx-content article.example-like .hint {
    display: block;
    margin-top: -0.75em;
}


.ptx-content .exercisegroup .exercisegroup-exercises.cols2, .ptx-content .exercisegroup .exercisegroup-exercises.cols3, .ptx-content .exercisegroup .exercisegroup-exercises.cols4, .ptx-content .exercisegroup .exercisegroup-exercises.cols5, .ptx-content .exercisegroup .exercisegroup-exercises.cols6 {
    width: 100%;
    display:inline-flex;
    flex-direction:row;
    flex-wrap:wrap;
    justify-content:flex-start;
    align-items:flex-start;
    align-content:flex-start;
}

.ptx-content .exercisegroup .exercisegroup-exercises.cols1 {
    display:inline;
}

.ptx-content .exercisegroup .exercisegroup-exercises.cols1 .knowl-output {
    display: block;
}

.ptx-content .exercisegroup .cols1 > article.exercise-like {flex-basis: calc(100% - 2em);}
.ptx-content .exercisegroup .cols2 > article.exercise-like {flex-basis: calc(50% - 2em);}
.ptx-content .exercisegroup .cols3 > article.exercise-like {flex-basis: calc(33.33% - 2em);}
.ptx-content .exercisegroup .cols4 > article.exercise-like {flex-basis: calc(25% - 2em);}
.ptx-content .exercisegroup .cols5 > article.exercise-like {flex-basis: calc(20% - 2em);}
.ptx-content .exercisegroup .cols6 > article.exercise-like {flex-basis: calc(16.66% - 2em);}

/* math directly adajacent to words is wrapped to avoid bad line breaks */
.ptx-content .mathword {
    white-space: nowrap;
}

.ptx-content .unit,
.ptx-content .quantity {
    white-space: nowrap;
    word-spacing: -0.25ex;
    margin-right: 0.125em;
}
.ptx-content .unit sub,
.ptx-content .unit sup,
.ptx-content .quantity sub,
.ptx-content .quantity sup {
     word-spacing: normal;
}

.ptx-content .code-inline,
.ptx-content .code-block,
.ptx-content .console,
.ptx-content .program,
.ptx-content .program code {
    font-family: "Inconsolata", monospace;
}
.ptx-content .code-block,
.ptx-content .console,
.ptx-content .program {
    overflow-x: auto;
}

.ptx-content .code-inline {
    font-size: 1em;
    white-space: pre;
    color: inherit;
    background: #eeeeee;
    border: 1px solid #dddddd;
    padding: 0.0625em 0.25em;
    margin-left: 0.2em;
    margin-right: 0.2em;
    border-radius: 0.2em;
}
.ptx-content .code-inline:first-child {
    margin-left: 0;
}
.ptx-content .title .code-inline {
    padding-left: 0;
    padding-right: 0;
    margin-left: 0;
    margin-right: 0;
}
.ptx-content a .code-inline {
    background: #f6f6f6;
}

.ptx-content .kbdkey {
    background: #f1f1f1;
    border: 1px solid #dddddd;
    border-radius: 3px;
    padding: 1px 2px 0 2px;
    vertical-align: 0.1em;
    font-size: 110%;
    line-height: 1;
    box-shadow: 2px 2px grey;
    display: inline-block;
    margin-right: 3px;
}
.ptx-content .kbdkey {
    color: #333;
}

.ptx-content .sagecell_sessionOutput pre {
    font-family: 'Inconsolata', monospace;
}

.ptx-content .sagecell {
    white-space: normal;
    margin-top: 1.25em;
    margin-bottom: 1.25em;
}
.ptx-content .sage-interact.sagecell {
    margin: 0;
}

.ptx-content .sagecell_evalButton {
  font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  padding: 0 0.65em;
}
.ptx-content .sagecell_evalButton {
  cursor: pointer;
  display: inline-block;
  vertical-align: middle;
  /* Disable accidental text-selection */
  user-select: none;
  /* Truncate overflowing text with ellipsis */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-width: 1px;
  border-style: solid;
  font-weight: bold;
  border-radius: 3px;
}
.ptx-content .sagecell_evalButton {
  color: #383838;
  background-image: linear-gradient(#f7f7f7, #bbbbbb);
  border-color: #c4c4c4;
}
.ptx-content .sagecell_evalButton:hover {
  color: #181868;
  background-image: linear-gradient(#bbbbbb, #f7f7f7);
}
.ptx-content .sagecell_evalButton:focus,
.ptx-content .sagecell_evalButton:active {
  color: #20160b;
  background-image: linear-gradient(#ff6852, #ffd7d1);
  border-color: #ff2822;
}

.ptx-content .sagecell .sagecell_editor {
  margin-bottom: 8px;
}

.ptx-content .booktitle {
    font-style: oblique;
}

.ptx-content .objectives > .heading,
.ptx-content .outcomes > .heading {
    font-size: 1.25em;
}

/* Born-hidden example with a very long title */
/* http://physics.thomasmore.edu/ConnectedPhysics/sss-netforce.html */
.ptx-content a .heading {
    white-space: normal;
}


.ptx-content .solutions > a, .ptx-content .solutions > a:hover, .ptx-content .solutions > a.active,
.ptx-content .instructions > a, .ptx-content .instructions > a:hover, .ptx-content .instructions > a.active {
    display: inline-block;
    margin-right: 1.5em;
}

/* When the knowl is a Hint, Answer, or Solution, put a little
   triangle in front of it */
.ptx-content .solutions > a::before,
.ptx-content .instructions > a::before {
    content: '\25ba';
    font-size: 70%;
    color: #06a;
    position: relative;
    top: -2px;
    right: 3px;
}
.ptx-content .solutions > a.active::before,
.ptx-content .instructions > a.active::before {
    content: '\25bc';
    animation-name: solutiontriangle;
    animation-duration: 3s;
    animation-iteration-count: 1;
}
.ptx-content .solutions > a[data-knowl]::after,
.ptx-content .instructions > a[data-knowl]::after {
    left: 12px;
}
@keyframes solutiontriangle {
    from {content: '\25ba';}
    to {content: '\25bc';}
}

.ptx-content section.solutions {
    font-size: 90%;
    padding-left: 1em;
    border-left: 1em solid #eeeeee;
}

.ptx-content.ptx-content > section.solutions:first-child {
    padding-left: 0;
    border-left: none;
}

.ptx-content article.example-like > .solution-like,
.ptx-content article.exercise-like > .solution-like {
    margin-top: 1.0em;
    padding-left: 0.7em;
}
.ptx-content article.example-like > .solution-like > .heading,
.ptx-content article.exercise-like > .solution-like > .heading {
    font-size: 100%;
    font-weight: 700;
    margin-right: 0.25em;
    display: inline;
}
.ptx-content article.example-like > .solution-like > .heading + .para,
.ptx-content article.exercise-like > .solution-like > .heading + .para {
    display: inline;
}




/* these were taken from the local add-on.css.
 * need to check if the are needed.
 */

.ptx-content article > figure:first-child {
    margin-top: 0;
}

.ptx-content figure + figure,
.ptx-content figure + .sidebyside,
.ptx-content .sidebyside + .sidebyside,
.ptx-content article + figure,
.ptx-content .sidebyside + figure {
    padding-top: 1.0em;
}


.ptx-content img {
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
}

/* is .cs for commutative diagrams? */
.ptx-content img.cs {
    display: block;
    margin-top: 20px;
    margin-bottom: 20px;
    margin-left: auto;
    margin-right: auto;
}

.ptx-content img:not(.cs) {
    max-width: 650px;
}

.ptx-content .tabular-box.natural-width table {
    margin-left: auto;
    margin-right: auto;
}

.ptx-content figure img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.ptx-content figure img + img {
    margin-top: 30px;
}

.ptx-content div.center img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.ptx-content div.center + div.center > img {
    margin-top: 60px;
}

.ptx-content div.center > img + img {
    margin-top: 60px;
}

.ptx-content figure table {
    margin-left: auto;
    margin-right: auto;
}

.ptx-content .caption {
    margin-top: 10px;
    margin-left: auto;
    margin-right: auto;
    font-size: 100%;
    text-align: center;
}


.ptx-content figure.wrap img {
    width: 250px;
}
.ptx-content figure.wrap {
    float: right;
    margin-right: 0;
    margin-left: 30px;
}
.ptx-content figure img.wrap {
    float: right;
    margin: 0;
}

.ptx-content figure figcaption.wrap {
    margin: 10px;
    font-size: 100%;
    text-align: center;
}

.ptx-content figure, .ptx-content .image-box {
    margin-top: 0.5em;
}
.ptx-content figure .image-box {
    margin-top: 0;
}
.ptx-content .sidebyside figure {
    margin-top: 0;
}
.ptx-content .image-box img,  /* See sample article Graphics section */
.ptx-content img.contained,  /* See sample article Graphics section */
.ptx-content .sbspanel img {
   /* previously these were hard-coded in the HTML */
    width: 100%;
    height: auto;
}

/* these seem to be obsolete because an img has to be in a .image-box .
   Check on that.
.ptx-content .sbspanel > img:not(.draw_on_me):not(.mag_popup),
.ptx-content figure > img:not(.draw_on_me):not(.mag_popup),
.ptx-content figure > div > img:not(.draw_on_me):not(.mag_popup),
*/
.ptx-content .image-box > img:not(.draw_on_me):not(.mag_popup) {
    cursor: zoom-in;
}
.ptx-content img.mag_popup {
    border: 1px solid #666;
    box-shadow: 4px 6px 4px #999;
    cursor: zoom-out;
    max-width: 600px;
}
.ptx-content .mag_popup_container {
    width:100%;
    position:absolute;
    z-index:1001;
    overflow-x: visible;
}

.ptx-content .image-box,
.ptx-content .audio-box,
.ptx-content .video-box,
.ptx-content .asymptote-box {
    position: relative;
}
.ptx-content .image-box .asymptote-box iframe.asymptote,
.ptx-content iframe.asymptote,
.ptx-content .video-box .video,
.ptx-content .video-box .video-poster {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
}
.ptx-content section > .audio-box,
.ptx-content section > .video-box,
.ptx-content section > .image-box {
    margin-top: 0.75em;
}

.ptx-content .audio {
    width: 100%;
}

.caption .heading {
    font-weight: bold;
}

.caption .counter {
    font-weight: bold;
}

.ptx-content div.quote {
    padding-left: 40px;
    padding-right: 10px;
    margin-bottom: 1em;
}

.minipage  + .minipage {
    display: inline-block;
}

.ptx-content code.inline {
    background: none;
    border: none;
}

/* These next are for Prism */
.ptx-content pre.program,
.ptx-content pre.program code,
.ptx-content pre.code-block,
.ptx-content pre.code-block code {
    line-height: 1.1;
}
.ptx-content section > .code-box,
.ptx-content .para + .code-box,
.ptx-content section > .code-block,
.ptx-content .para + .code-block {
    margin-top: 1em;
}

.ptx-content pre.program,
.ptx-content pre.code-block {
    margin-top: 0;
    padding-left: 15px;
    border-left: 1px solid #aaa;
    font-size: 93%;
    overflow: auto;
}
.ptx-content pre.program:before,
.ptx-content pre.code-block:before {
    content:' ';
    font-size: 50%;
    border-top: 1px solid #aaa;
    display: block;
    margin-right: auto;
    margin-left: -15px;
    width: 3.0em;
}

.ptx-content pre[data-line].program, 
.ptx-content pre[data-line].code-block
{
    padding-left: 2.5em;
}

.ptx-content pre[data-line].program:before,
.ptx-content pre[data-line].code-block:before {
    margin-left: -5em;
}

.ptx-content pre.program.line-numbers,
.ptx-content pre.code-block.line-numbers
{
    padding-left: 3.5em;
    overflow: visible;
}

.ptx-content pre.program.line-numbers:before,
.ptx-content pre.code-block.line-numbers:before {
    margin-left: -7em;
}

/* fine tune next 3 based on line-height of surrounding pre  */
.ptx-content pre[data-line].line-numbers code {
    padding-top: 0em;  /* increase with line-height */
}
.ptx-content pre[data-line].line-numbers .line-highlight {
    margin-top: 0em; /* decreases as line-height increases */
}
.ptx-content pre[data-line]:not(.line-numbers) .line-highlight {
    margin-top: 0.6em; /* decreases as line-height increases */
}


/* next is for the old code formatting js */
.ptx-content pre.prettyprint,
.ptx-content pre.plainprint {
    margin-top: 0;
    padding-left: 15px;
    border-left: 1px solid #aaa;
    font-size: 93%;
    overflow: auto;
/* preveiously turned off the border and padding from pretty.css */
}

.ptx-content pre.prettyprint:before,
.ptx-content pre.plainprint:before {
    content:'';
    font-size: 50%;
    border-top: 1px solid #aaa;
    display: block;
    margin-right: auto;
    margin-left: -15px;
    width: 2.5em;
}

.ptx-content .objectives {
    margin-bottom: 1.25em;
}


.ptx-content ol > li {
    padding-left: 0.25em;
}
.ptx-content ol.cols2 > li, .ptx-content ul.cols2 > li { width: calc(49% - 1.75em); min-width: 190px}
/*
.ptx-content ol.cols2 > li, .ptx-content ul.cols2 > li { width: 50%; min-width: 240px}
*/
.ptx-content ol.cols3 > li, .ptx-content ul.cols3 > li { width: calc(33% - 1.25em); min-width: 160px}
/*
.ptx-content ol.cols3 > li, .ptx-content ul.cols3 > li { width: 31%; min-width: 160px}
*/
.ptx-content ol.cols4 > li, .ptx-content ul.cols4 > li { width: calc(24.5% - 1.25em); min-width: 100px}
.ptx-content ol.cols5 > li, .ptx-content ul.cols5 > li { width: calc(19.5% - 0.75em); min-width: 90px}
.ptx-content ol.cols6 > li, .ptx-content ul.cols6 > li { width: calc(16.3% - 0.5em); min-width: 80px}
/* sample-article sec 5 */
.ptx-content ul.cols2 > li:nth-child(odd), .ptx-content ol.cols2 > li:nth-child(odd) {
   margin-right: 2em;
}

/*
.ptx-content .cols2 > li:first-child,
.ptx-content .cols3 > li:first-child,
.ptx-content .cols4 > li:first-child,
.ptx-content .cols5 > li:first-child,
.ptx-content .cols6 > li:first-child {
    margin-top: 0.5em;
}
*/

.ptx-content .cols2  ol,
.ptx-content .cols3  ol,
.ptx-content .cols4  ol,
.ptx-content .cols5  ol,
.ptx-content .cols6  ol {
    padding-left: 0.7em;
}
.ptx-content .exercisegroup-exercises > article.exercise-like {
    margin-top: 1em;
}


/* see http://bob.cs.sonoma.edu/IntroCompOrg-RPi/exercises-10.html
  for examples of an odd number of items in a cols2, followed by
  a hint */
.ptx-content .cols2 > li:last-child:nth-child(odd) {
    float: none !important;
    padding-top: 0.5em;
}


/* http://spot.pcc.edu/math/APEXCalculus/sec_prod_quot_rules.html
 * solution to Example 2.4.14
 */
.ptx-content .solution ol li {
    margin-top: 1em;
    padding-left: 0.5em;
}

/* solution to Example 4.2.12 in http://spot.pcc.edu/math/orcca-draft/orcca/section-radical-expressions-and-rational-exponents.html
*/
.ptx-content .solution ol li > .para:first-child, .ptx-content .solution ol li > .displaymath:first-child {
    vertical-align: top;
    display: inline-block;
    margin-top: 0;
}
.ptx-content .solution ol li > .displaymath:first-child .MJXc-display {
    margin-top: 0;
}


.ptx-content .exercise-like ol li {
    margin-top: 1em;
    padding-left: 0.5em;
}

.ptx-content .exercise-like > .cols2 > li { width: calc(49% - 2.5em)}
.ptx-content .exercise-like > .cols3 > li { width: calc(33% - 2.5em)}
.ptx-content .exercise-like > .cols4 > li { width: calc(24.5% - 2.5em)}
.ptx-content .exercise-like > .cols5 > li { width: calc(19.5% - 2.5em)}
.ptx-content .exercise-like > .cols6 > li { width: calc(16.3% - 2.5em)}

/* A colsN in a knowl needs to be narrower because of the margin/padding of the knowl */
.ptx-content .knowl .exercise-like > .cols2 > li { width: calc(49% - 2em)}
/* next 4 not actually checked: just copied from cols2 */
.ptx-content .knowl .exercise-like > .cols3 > li { width: calc(33% - 2em)}
.ptx-content .knowl .exercise-like > .cols4 > li { width: calc(24.5% - 2em)}
.ptx-content .knowl .exercise-like > .cols5 > li { width: calc(19.5% - 2em)}
.ptx-content .knowl .exercise-like > .cols6 > li { width: calc(16.3% - 2em)}


.ptx-content .exercise-like ol li > .para:first-child {
    vertical-align: top;
    display: inline-block;
    margin-top: 0;
}

.ptx-content .contributor .contributor-name {
    font-variant: small-caps;
}
.ptx-content .contributor .contributor-info {
    font-size: 88%;
    font-style: italic;
    margin-left: 3ex;
}
.ptx-content .contributor {
    margin-top: 3ex;
}
.ptx-content .contributor + .contributor {
    margin-top: 1.5ex;
}

.ptx-content .contributor + .para {
    margin-top: 3ex;
}

.ptx-content .frontmatter .contributors, .ptx-content .book .contributors {
    text-align: center;
    font-style: normal;
}

.pretext .searchwrapper {
    max-width: 900px;
    position: absolute;
    right: 0;
    bottom: 0;
    margin-bottom: 39px;
}

.pretext .searchwrapper .cse .gsc-control-cse, .searchwrapper .gsc-control-cse  {
    padding: 0;
    border: none;
    width: 25ex;
}
.pretext .searchwrapper .cse .gsc-search-button input.gsc-search-button-v2, .searchwrapper input.gsc-search-button-v2 {
    padding: 2px 2px;
}
.pretext .searchwrapper form.gsc-search-box {
    margin: 0;
}
.pretext .searchwrapper table.gsc-search-box {
    margin: 0;
}
.pretext .searchwrapper .gsc-search-box-tools .gsc-search-box .gsc-input {
    padding: 0;
}
.pretext .searchwrapper .gsib_a {
    padding: 0 0 0 5px;
}
.pretext .searchwrapper .gsc-input-box {
    height: 3.0ex;
}
.pretext .searchwrapper form.gsc-search-box {
    font-size: 12px;
}

/* turn off the green parentheses Alex does not like */
.ptx-content div.CodeMirror span.CodeMirror-matchingbracket {color: #090;}

.ptx-content .image-archive {
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 0;  /* was auto */
    margin-top: 0.75em;
    padding-bottom: 0.25em;
    text-align: center;
}
.ptx-content .image-archive > a {
    display: inline-block;
    padding-left: 0.5em;
    padding-right: 0.5em;
    font-family: monospace;
}

.ptx-content iframe {
    margin: 0;
    border: none;
    box-sizing: border-box;
}

.ptx-content .times-sign {
    font-size: larger;
    vertical-align: -0.15ex;
}
/* temporary for Geogebra development: replace with a more
  restrictive selector for articles */
.ptx-content article.notranslate {
    margin-top: 0;
}

/*
nested tasks. see
https://pretextbook.org/examples/sample-article/html/interesting-corollary.html#aBc
*/

/* 9/27/23  added "article" because of details.exercise-like */
.ptx-content article.exercise-like > .exercise-like {
    margin-left: 40px;
}
.ptx-content article.exercise-like > .exercise-like.task {
    margin-left: 20px;
}
.ptx-content article.exercise-like > .exercise-like > .para {
    margin-top: 1.25em;
/*    margin-bottom: 0.25em; */
}
.ptx-content article.example-like > .heading + .introduction {
    display: inline;
}
.ptx-content article.example-like > .heading + .introduction > .para:first-child {
    display: inline;
}
.ptx-content article.example-like > .exercise-like > .para {
    margin-top: 1.25em;
}

/* end of nested tasks */

/* genus and species in italics */
.ptx-content .taxon {
    font-style: italic;
}

/* Sage stuff */
.ptx-content .sageanswer {
    font-family: monospace;
    white-space: pre;
    margin-left: 3em;
    margin-bottom: 2em;
}
.ptx-content .sageanswer .key {
    display: inline-block;
    vertical-align: top;
    margin-right: 1em;
}
.ptx-content .sageanswer .output {
    display: inline-block;
    vertical-align: top;
}
.ptx-content .CodeMirror-code pre.CodeMirror-line {
    padding-bottom: 5px;
/* the next item is the CodeMirror default, which was
 previously over-ridden */
    padding-left: 6px;
}

/* used when knowl content is hidden in the page */
.ptx-content .hidden-content, .pretext .hidden-content {
/* things will be different after 2022 overhaul */
    display: none;
}

.ptx-content hr.ptx-pagebreak {
    width: 30em;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 2.0em;
    margin-top: 0;
    height: 4em;
    border: 0;
    border-bottom: 1px dashed #ccc;
}

.ptx-content hr.ptx-pagebreak:after {
    content: "page";
    display: inline-block;
    position: relative;
    top: 4.0em;
    font-size: 80%;
    padding: 0 0.25em;
    background: white;
}

/*
   See 10.1.8c in http://faculty.valpo.edu/calculus3ibl/ch10_01_gradient.html
and condider having this replace line 3338 of the general code (which uses .heading + p)
*/
.ptx-content .example-like > .exercise-like > .para:first-of-type {
    display: inline;
}
.ptx-content .example-like > .exercise-like > .aside-like {
    margin-top: -3em;
}
.ptx-content .example-like > .exercise-like > .aside-like.front {
    margin-top: 0;
}

.ptx-content meta {
    display: none;
}

.ptx-content .summary-links a {
  color: #671d12;
  background: #f0f0f0;
  text-decoration: none;
  cursor: pointer;
}
.ptx-content .summary-links a:hover, .ptx-content .summary-links a:focus {
  color: white;
  background: #671d12;
}
.ptx-content .summary-links a .codenumber {
  color: #303030;
  margin-right: 0.41667em;
}

.ptx-content .summary-links a:hover .codenumber, .ptx-content .summary-links a:focus .codenumber {
  color: #f0f0f0;
}



.ptx-content .summary-links {
    margin-top: 4em;
}
.ptx-content section + .summary-links {
    margin-top: 2em;
}
.ptx-content .summary-links ul {
    list-style-type:none;
}
.ptx-content .summary-links li {
    margin-top: 0;
}
.ptx-content section .summary-links li .title {
    font-style: normal;
}
.ptx-content .summary-links a {
  position: relative;
  display: block;
  font-size: 1.5em;
  line-height: 1.25em;
  padding: 0.41667em 0.83333em;
  margin-top: 0.20833em;
  border-radius: 3px;
  padding-right: 2.06667em;
}
.ptx-content .summary-links a:after {
  right: 0.83333em;
}
.ptx-content .summary-links a:after {
  content: "";
  position: absolute;
  /* center vertically */
  top: 50%;
  margin-top: -0.4em;
  width: 0;
  height: 0;
  border-top: 0.4em solid transparent;
  border-bottom: 0.4em solid transparent;
  border-left: 0.4em solid #c9c9c9;
}
.ptx-content .summary-links a, .ptx-content .summary-links a:link, .ptx-content .summary-links a:visited {
  cursor: pointer;
}
.ptx-content .summary-links a:hover:after {
  width: 0;
  height: 0;
  border-top: 0.4em solid transparent;
  border-bottom: 0.4em solid transparent;
  border-left: 0.4em solid white;
}
.ptx-content .summary-links a {
  font-family: "PT Serif", "Times New Roman", Times, serif;
}
@media screen and (max-width: 480px) {
  .ptx-content .summary-links a {
    font-size: 1em;
    line-height: 1.25em;
  }
}
.ptx-content .summary-links a .codenumber {
  margin-right: 0.41667em;
}

.ptx-content .summary-links a:active {
  position: relative;
  color: white;
  background: #932919;
  text-decoration: none;
  box-shadow: rgba(0, 0, 0, 0.2) 0 2px 5px 5px inset;
}
.ptx-content .summary-links a:active:after {
  width: 0;
  height: 0;
  border-top: 0.4em solid transparent;
  border-bottom: 0.4em solid transparent;
  border-left: 0.4em solid white;
}
.ptx-content .summary-links a:focus {
  outline: thin dotted #333;
  outline-offset: -2px;
  /**
   * Remove stupid inner dotted border applied by Firefox on focus
   * See http://stackoverflow.com/a/199319/1599617
   */
}


/* also see section > heading for worksheets, maybe around line 1200 */
/* one-page documents in the browser */

body.standalone.worksheet .ptx-content .onepage > .heading {
    margin-top: 0;
    font-size: 1.3em;
}
body.standalone.worksheet .ptx-content .onepage > .introduction {
    margin-top: 0.4em;
}
body.standalone.worksheet .ptx-content .onepage > .introduction > .heading {
    font-size: 1.1em;
}
body.standalone.worksheet .ptx-content .onepage .solutions,
body.standalone.worksheet .ptx-content .onepage .instructions {
    display: none;
}
body.standalone .ptx-content .worksheet {
/*
    padding: 40px 45px 45px 55px;
*/
    padding: 40px 0 45px 0;
    border: 2px solid grey;
    margin: 0;
/* height: 1243px; */
}

body.standalone .ptx-content .onepage {
/*    padding: 40px 45px 45px 55px;
    padding: 0 0 45px 0;
*/
    padding: 40px 45px 45px 55px;
    border-bottom: 2px solid grey;
    margin: 0;
/* height: 1243px; */
}
body.standalone .ptx-content .onepage + .onepage {
/*
    padding-top: 40px;
*/
    border-top: 2px solid grey;
}
/* there may be worksheet content before the first page
   or after the last page
*/
body.standalone .ptx-content .onepage.firstpage {
    padding-top: 0
}
body.standalone .ptx-content .onepage.lastpage {
    padding-bottom: 0;
    border-bottom: none;
}

body.standalone .ptx-content .worksheet > *:last-child {
    padding-bottom: 0 !important
}
.ptx-content .onepage + .onepage {
    margin-top: 2.5em;
    padding-top: 1.5em;
    border-top: 1px dashed #aaa;
}
.ptx-content .onepage + .onepage::before {
    content: "pagebreak";
    text-align: center;
    margin-left: 40%;
    padding-left: 1em;
    padding-right: 1em;
    position: absolute;
    top: -0.8em;
    font-size: 80%;
    font-style: italic;
    background: white;
}

body.standalone .ptx-content .onepage + .onepage {
    margin-top: 10px;
}
body.standalone .ptx-content .onepage + .onepage::before {
    content: none;
}

body.standalone .ptx-content .onepage article {
    padding-left: 0;
    border: none;
}
body.standalone .ptx-content .onepage article::after {
    all: unset;
}
.ptx-content .onepage > .para:first-child,
.ptx-content .onepage > article:first-child {
    margin-top: 0;
}
.ptx-content section + .onepage.firstpage,
.ptx-content article + .onepage.firstpage,
.ptx-content .para + .onepage.firstpage {
    margin-top: 1.25em;
}

/* not good, because of image next to image
.ptx-content .onepage .sbspanel + .sbspanel {
    padding-left: 1.25em;
    border-left: 1px solid grey;
    margin-left: -1.25em;
}
*/
body.worksheet .ptx-content .onepage .sbspanel + .sbspanel > .exercise::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    padding-left: 1.25em;
    border-left: 1px solid grey;
    margin-left: -1.25em;
    z-index: -100;  /* to not block editable content */
}

body.standalone.worksheet .ptx-content section article.task {
    margin-left: 0;
}
body.standalone.worksheet .ptx-content section article.task > .heading {
    font-weight: normal;
}

body.standalone .autopermalink {
    display: none;
}

body.standalone.worksheet .ptx-content .onepage .workspace {
    border: 2px dotted grey;
    background: #f3fff3;
/*  Sally suggests light and dark blue
    background: linear-gradient(
        #eef 0px, #eef 200px,
        #eef 200px, #99f 205px,
        #99f 205px, #99f 100%)
*/
}
body.standalone.worksheet .ptx-content .onepage .workspace.squashed {
    border: 2px dotted grey;
    background: #ffe;
}

body.standalone.worksheet .ptx-content .onepage .workspace.squashed.tight {
    border: 15px solid;
    border-image: repeating-linear-gradient(
      -35deg,
      #f33,
      #f33 10px,
      #000 10px,
      #000 20px
    ) 20;
/*
    background: linear-gradient(
        #ff0 0%, #ff0 8%,
        #000 8%, #000 9%,
        #ff6 9%, #ff6 17%,
        #555 17%, #555 19%,
        #ff8 19%, #ff8 26%,
        #777 26%, #777 29%,
        #ffa 29%, #ffa 37%,
        #aaa 37%, #aaa 41%,
        #ffd 41%, #ffd 48%,
        #ccc 48%, #ccc 52%,
        #ffd 52%, #ffd 59%,
        #aaa 59%, #aaa 63%,
        #ffa 63%, #ffa 71%,
        #777 71%, #777 74%,
        #ff8 74%, #ff8 81%,
        #555 81%, #555 83%,
        #ff6 83%, #ff6 91%,
        #000 91%, #000 92%,
        #ff0 92%, #ff0 100%
        );
*/
    background: yellow;
}

body.has-sidebar-left.mathbook-loaded.standalone.worksheet .ptx-page .ptx-main {
    margin-left: 0;
}

body.standalone.worksheet .ptx-content .goal-like {
    border: none;
    padding: 0;
}
body.standalone.worksheet .ptx-content .goal-like > .heading {
    margin-top: -0.5em;
    padding: 0;
    margin: 0;
    font-size: 1.1em;
}
body.standalone.worksheet .ptx-content section.worksheet > .heading {
    display: inline;
    font-size: 1.1em;
}
/* becaues the worksheet has no side margins but the .onepage does */
body.standalone.worksheet .ptx-content section.worksheet > .heading,
body.standalone.worksheet .ptx-content section.worksheet > .objectives,
body.standalone.worksheet .ptx-content section.worksheet > .introduction,
body.standalone.worksheet .ptx-content section.worksheet > .conclusion {
    margin-left: 55px;
    margin-right: 40px;
}
body.standalone.worksheet .ptx-content section.worksheet > .heading + .para {
    display: inline;
}

/* printing for one-page worksheets */

.ui-dialog.ui-widget.ui-widget-content.ui-corner-all.ui-draggable.ui-resizable {
    left: 0 !important;
    top: 0 !important;
}

/* move to the color file(s) and figure out next comment */
/*
.ptx-content a.internal {
    color: #900;
}
.ptx-content a.internal:hover {
    background-color: #ddf;
}
*/
/* check whether class="url" under Endnotes in pretext-epub.xsl can be
   changed to class = "external"*/
.ptx-content a.url,
.ptx-content a.external {
    color: #22a;
}
.ptx-content a.url:hover,
.ptx-content a.external:hover {
    background: #ffd;
}

/*
.ptx-content a.internal:hover,
.ptx-content a.external:hover,
.ptx-content a.internal:focus,
.ptx-content a.external:focus {
    text-decoration: underline;
}
*/

/* style for poems */

.ptx-content .poem {
    margin-top: 1.5em;
}
.ptx-content .poem {
    display: table;
    margin-top: 1.5em;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 0;
    width: auto;
    max-width: 90%;
}

.ptx-content .poem > .heading {
    display: block;
    text-align: center;
}
.ptx-content section article.poem > .heading::after {
    content: "";
}
.ptx-content .poem > .heading > .title {
    font-weight: bold;
    font-size: 1.2em;
    line-height: 1.2em;
}

.ptx-content .poem .author {
    font-style: italic;
    margin-top: 0.75em;
}
.ptx-content .poem .author.left {
    text-align: left;
}
.ptx-content .poem .author.center {
    text-align: center;
}
.ptx-content .poem .author.right {
    text-align: right;
}

.ptx-content .poem .stanza > .heading {
    text-align: center;
    font-weight: bold;
    font-size: 1em;
    line-height: 1em;
}
.ptx-content .poem .stanza + .stanza {
    margin-top: 1em;
}
.ptx-content .poem .heading + .stanza {
    margin-top: 0.2em;
}
.ptx-content .poem .heading + .line {
    margin-top: 0.2em;
}

.ptx-content .poem .line.left {
    text-align: left;
    margin-left: 4em;
    text-indent: -4em;
}
.ptx-content .poem .line.center {
    text-align: center;
}
.ptx-content .poem .line.right {
    text-align: right;
}
.ptx-content .poem .tab {
    margin-left: 2em;
}

/* GeoGebra calculator */

.calculator-container {
    position: fixed;
    z-index: 100;
    bottom: 5px;
    right: 5px;
/*
    width: 320px;
*/
    width: 253px;
/*
    height: 600px;
*/
    height: 460px;
}
@media screen and (max-width: 800px) {
    .calculator-container {
         bottom: 50px !important;
    }
}

.toolBPanel {
    overflow: hidden !important;
}
.toolBPanel:hover {
    overflow: auto !important;
}

#aboelkins-ACS .ptx-main .ptx-content > section:first-of-type > section:first-of-type > .project-like:first-of-type li {
    font-size: 300%
}
/*  WW problems */

.ptx-content .wwprob table.attemptResults {
    margin-left: 2em;
    background: #efefef;
    padding: 0.2em;
}
.ptx-content .wwprob table.attemptResults + .attemptResultsSummary {
    margin-top: 1em;
}

.ptx-content .wwprob .problem-main-form {
    margin-top: 1em;
    background: #eeeeff;
    padding: 0.5em;
}
.ptx-content .wwprob td.ResultsWithoutError {
    background: #9f9;
}
.ptx-content .wwprob td.ResultsWithError {
    background: #f99;
}

.ptx-content .wwprob tr th {
    text-align: center;
    padding: 0.2em 1em 0.2em 1em;
}
.ptx-content .wwprob tr td {
    text-align: center;
}
.ptx-content .wwprob tr td:empty {
    background: #fff;
}

.ptx-content .wwprob ol, .ptx-content .wwprob ul {
    margin-top: 0.75em !important;
}

.ptx-content .wwprob .problem {
    background: #fdfdfd;
}

.ptx-content .wwprob .problem a {
    text-decoration: none;
}

.ptx-content .wwprob #footer {
    font-size: 70%;
    text-align: right;
}

.ptx-content .marginresource {
    position: relative;
    height: 0;
    left: 40em;
    top: 1em;
}
.ptx-content .marginresource a {
    color: blue;
}
.ptx-content .marginresource a[knowl] {
    border-bottom: 1px dotted blue;
}
.ptx-content .marginresource .icon {
    font-size: 200%;
    margin-right: 1em;
    display: inline-block;
}
.ptx-content .marginresource .resource_description {
    display: inline-block;
}
.ptx-content .marginresource .resource_links {
    display: block;
    margin-left: 2em;
}

.collectedworks .knowl-output {
    border: 12px
    solid #D6E3FF;
    background: none repeat scroll 0% 0% #FAFCFF;
    border-radius: 4px;
    margin-bottom: 1.25em;
}

.collectedworks .subjectwork {
    max-width: 750px;
}

.collectedworks .bib {
    margin-bottom: 1em;
}

.collectedworks .bibitem + .bibentry {
    display: inline;
}

.collectedworks .bibitem {
    display: inline;
    font-weight: bold;
    margin-right: 1em;
}
.collectedworks .work .title a {
    text-decoration: none;
    color: #009;
}
.collectedworks .work .title {
}


.iconlegend {
    position: absolute;
    margin-top: 0.5em;
    top: 0;
    left: 920px;
    line-height: 1;
}

.iconlegend .icon_name {
    font-size: 90%;
    margin-right: 1em;
}
.icongroup + .icongroup {
    margin-left: 1em;
}

/* interactive WeBWorK */

label.webwork {
display:inline-flex;
flex-direction:column;
}

label.correct .status {
background-color: #a0f0a0;
}

label.partly-correct .status {
 color: #ffcc66;
}

label.incorrect .status {
  color: #b00;
}
label.incorrect .status::before {
    content: " ";
}

.feedback {
 word-wrap:break-word;
}

label.correct .feedback {
 background-color: #00ffcc;
}

label.partly-correct .feedback {
 color: #ffcc66;
}

label.incorrect .feedback {
 color: #e07070;
}


.ptx-content .webwork-button {
    border-radius: 3px;
    padding: 0px 3px 0px 3px;
    border: 1px solid #999;
    background-color: #ffffff;
}

.ptx-content .webwork-button:hover {
    cursor: pointer;
    background-color: #e0e0ff;
    border: 1px solid #000;
}
.ptx-content .webwork-button:active {
    cursor: pointer;
    background-color: #a0a0a0;
    border: 1px solid #999;
}

.webwork img, .webwork + .knowl-output img {max-width:100%;}

.ptx-content .exercise-wrapper form button {
    border-radius: 3px;
    padding: 0px 3px 0px 3px;
    border: 1px solid #999;
    color: black;
    background-color: #ffffff;
}
.ptx-content .webwork-button.activate {
    width: 22px;
    height: 22px;
    background-image: url('https://raw.githubusercontent.com/openwebwork/webwork2/main/htdocs/images/favicon.ico');
    background-size: contain;
    position: absolute;
    right: -35px;
}

article.project-like > .heading + div.ptx-runestone-container > div.runestone,
article.exercise-like > .heading + div.ptx-runestone-container > div.runestone {
    margin-top: 0.5em;
}

/* hack for runestone */
/*
.ptx-content .exercise-wrapper form button.btn-success {
    background-color: #5cb85c;
}
*/
/* to undo Runestone's presentermode.css */
.ptx-content .bottom {
    position: unset;
}

/* to undo Runestone's draganddrop.css */
.ptx-content .rsdraggable {
    font-size: 100%;
}

.ptx-content .exercise-wrapper form button:hover {
    cursor: pointer;
    background-color: #e0e0ff;
    border: 1px solid #000;
}
.ptx-content .exercise-wrapper form button:active {
    background-color: #f0f0f0;
}
.ptx-content .exercise-wrapper form button + button {
    margin-left: 0.8em;
}

.ptx-content .exercise-wrapper,
.ptx-content .exercise-wrapper form,
.ptx-content .exercise-wrapper form > div:first-child {
    display: inline-block;
    vertical-align: top;
    width: 100%; /* for live ww to open at 100% wide */
}
.ptx-content .knowl .exercise-wrapper,
.ptx-content .knowl .exercise-wrapper form,
.ptx-content .knowl .exercise-wrapper form > div:first-child {
    width: 100%;
}
/*
.ptx-content .exercise-wrapper form {
     max-width: 95%;
}
*/
.ptx-content .exercise-wrapper > .para:first-child,
.ptx-content .exercisegroup .exercise-wrapper > .para:first-child {
    margin-top: 0;
    display: inline;
}
/* next is realted to having exercises start in-line with their exercise number,
   including when a static WW problem is made interactive */
/* not sure this was the right way to do it */
/* see https://opentext.uleth.ca/apex-calculus/sec_antider.html#exercise-722 */
.ptx-content .heading + .exercise-wrapper {
    display: inline-block;
    max-width: 95%;
    width: 100%;
}
/*
.ptx-content .exercisegroup .heading + .exercise-wrapper {
    width: auto;
}
*/
.ptx-content .cols2 .heading + .exercise-wrapper {
    width: auto;
}

/* next two need to be separate due to limitations in Chrome and Safari */
@media screen and (max-width: 600px) {
    .ptx-content .exercisegroup .cols2 > article.exercise-like {flex-basis: calc(100% - 2em);}
    .ptx-content .exercisegroup .cols3 > article.exercise-like {flex-basis: calc(100% - 2em);}
    .ptx-content .exercisegroup .cols4 > article.exercise-like {flex-basis: calc(50% - 2em);}
    .ptx-content .exercisegroup .cols5 > article.exercise-like {flex-basis: calc(50% - 2em);}
    .ptx-content .exercisegroup .cols6 > article.exercise-like {flex-basis: calc(33.3% - 2em);}
    .ptx-content .exercisegroup .cols2 .heading + .exercise-wrapper { max-width: 100%; }
}
@media screen and (max-width: 850px) and (min-width: 786px) {
    .ptx-content .exercisegroup .cols2 > article.exercise-like {flex-basis: calc(100% - 2em);}
    .ptx-content .exercisegroup .cols3 > article.exercise-like {flex-basis: calc(100% - 2em);}
    .ptx-content .exercisegroup .cols4 > article.exercise-like {flex-basis: calc(50% - 2em);}
    .ptx-content .exercisegroup .cols5 > article.exercise-like {flex-basis: calc(50% - 2em);}
    .ptx-content .exercisegroup .cols6 > article.exercise-like {flex-basis: calc(33.3% - 2em);}
    .ptx-content .exercisegroup .cols2 .heading + .exercise-wrapper { max-width: 100%; }
}

.APEXlogo {
    white-space: nowrap;
}
.APEXlogo .A {
    margin-right: -0.07em;
}
.APEXlogo .P {
    margin-right: -0.33em;
    position: relative;
    top: -0.30em;
}
.APEXlogo .E {
    position: relative;
   top: 0.33em;
}

/* testing */


.runestone-profile .dropdown-content {
    position: absolute;
    display: none;
    right: 0;
    top: 35px;
    text-align: left;
    border: 1px solid;
    border-color: #600;
    border-color: var(--tocborder);
}
.runestone-profile.dropdown:hover {
    background-color: #ddd;
    overflow: visible;
}
.runestone-profile.dropdown:hover .dropdown-content {
    display: block;
}
.runestone-profile .dropdown-content {
    background-color: white;
    z-index: 1800;
    min-width: 100px;
    padding: 5px;
}
.runestone-profile .dropdown-content a {
    display: block;
    text-decoration: none;
    color: #662211;
    padding: 2px 8px;
}
.runestone-profile.dropdown .dropdown-content a:hover {
    background-color: #671d12;
    color: #ffffff;
    text-decoration: none;
    background-color: var(--chaptertoc);
}
.runestone-profile.dropdown .dropdown-content hr {
    margin-bottom: 4px;
    margin-top: 4px;
    border-color: #600;
    border-color: var(--sectiontoctext);
}