#side {
  position: fixed;
  left: 0px;
  top: 0px;
  height: 100%;
  padding-top: 60px;
  padding-bottom: 30px;
  width: 300px;
  box-sizing: border-box; }
  #side .nav-side {
    position: relative;
    height: 100%;
    overflow: auto; }

#side .nav-side > ul {
  padding: 0px; }
  #side .nav-side > ul li {
    padding-left: 0px;
    list-style-type: none; }

ul.toc {
  padding-left: 30px;
  list-style-type: none; }
  ul.toc .toc-expand:before {
    display: inline-block;
    width: 20px;
    content: "+";
    color: white;
    text-align: center;
    font-weight: bold;
    background: #5e2d0c;
    margin-left: 10px;
    border-radius: 5px;
    cursor: pointer; }
  ul.toc li.expanded > .toc-expand:before {
    content: "-"; }
  ul.toc li.active > .toc-expand:before {
    background: #aaa; }
  ul.toc ul {
    display: block;
    max-height: 0px;
    overflow: hidden;
    -webkit-transition: max-height 0.25s ease-out;
    transition: max-height 0.25s ease-out;
    padding-left: 20px;
    list-style-type: none;
    overflow: hidden; }
  ul.toc li.active > a {
    font-weight: bold; }
  ul.toc li.active > ul, ul.toc li.expanded > ul {
    display: block;
    max-height: 1000px;
    /* overflow-y: auto */
    -webkit-transition: max-height 0.25s ease-in;
    transition: max-height 0.25s ease-in; }
  ul.toc a {
    color: #000; }
  ul.toc a.selected:before {
    position: absolute;
    left: 10px;
    content: "\25B6"; }

ul.toc li {
  padding-bottom: 0px; }

@media screen and (max-width: 1450px) {
  #side {
    display: none; } }