.bd-toc {
  position: sticky;
  top: 4rem;
  height: calc(100vh - 4rem);
  overflow-y: auto; }

.bd-toc ul {
  list-style: none;
  padding-left: 1em;
  border-left: 1px solid #eee; }

.bd-toc li {
  margin-top: 1em;
  margin-bottom: 1em; }

/* TODO: move this to a separate style sheet */
.bigbutton {
  margin-left: 1em;
  margin-right: 1em; }