a.back-to-top {
  display: none;
  float: right;
  font-size: 0.7rem;
}
a.back-to-top.is-visible {
  display: block;
}

.toc-js-container.sticky {
  position: sticky;
}

.toc-js-container {
  display: none;
  overflow-y: auto;
  max-height: 100vh;
}
.toc-js-container.is-visible {
  display: block;
}

.toc-js li[aria-expanded="false"] > .collapsible {
  display: none;
}

.toc-js li[aria-expanded="false"]::before {
  content: "▶ ";
}

.toc-js li[aria-expanded="true"]::before {
  content: "▼ ";
}

.toc-js .collapsible {
  cursor: default;
}