.toc-container li.toc-era > .collapsible-section > summary {
  position: relative;
}

.toc-container li.toc-era > .collapsible-section > summary::before {
  content: ">";
  color: #888;
  position: absolute;
  left: -1rem;
  top: 0;
  margin-right: 0;
}

.toc-container li.toc-era > .collapsible-section[open] > summary::before {
  content: "\2228";
}

#sticky-toc .sticky-toc-title {
  color: #7d78b5;
  cursor: pointer;
  display: block;
  font-size: 1.25rem;
  line-height: 1.25;
  margin-bottom: 0.4rem;
  padding: 0.1rem 0.25rem;
  pointer-events: auto;
  position: relative;
  z-index: 2;
}

#sticky-toc .sticky-toc-sub {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.75rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

#sticky-toc .sticky-toc-sub.open {
  max-height: 60rem;
}