toc.css in Open Social 8.5

/*
 * Side navigation
 *
 * Scrollspy and affixed enhanced navigation to highlight sections and secondary
 * sections of docs content.
 */
.toc-wrapper.affix {
  position: static;
}

.toc-wrapper .nav li a {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: #555555;
  transition: color 0.5s;
  padding-top: 0;
  padding-bottom: 0;
}

.toc-wrapper .nav li a:before {
  content: '';
  position: absolute;
  left: -20px;
  top: 0;
  width: 3px;
  height: 100%;
  background-color: #f3f3f3;
  transition: background-color .3s, width .3s;
}

.toc-wrapper .nav li a:hover, .toc-wrapper .nav li a:focus {
  color: #29abe2;
  font-weight: 500;
}

.toc-wrapper .nav li.active a {
  color: #29abe2;
  font-weight: 500;
}

.toc-wrapper .nav li.active a:before {
  background-color: #29abe2;
}

.toc-wrapper .nav li a.back-to-top {
  display: none;
  color: #777;
  margin-top: 1rem;
}

/* Show and affix the side nav when space allows it */

@media (min-width: 900px) {
  .toc-wrapper {
    padding-left: 40px;
  }
  .toc-wrapper .nav > .active > ul {
    display: block;
  }
  /* Widen the fixed sidebar */
  .toc-wrapper.affix,
  .toc-wrapper.affix-bottom {
    width: 320px;
  }
  .toc-wrapper.affix {
    position: fixed;
    /* Undo the static from mobile first approach */
    top: 74px;
  }
  .toc-wrapper.affix-bottom {
    position: absolute;
    /* Undo the static from mobile first approach */
  }
  .toc-wrapper.affix-bottom .table-of-contents,
  .toc-wrapper.affix .table-of-contents {
    margin-top: 0;
    margin-bottom: 0;
  }
  .back-to-top {
    display: block;
  }
}