.site-toc{
  margin-block-end: 3rem;
}
.site-toc ol{
  border-left: 3px solid var(--border-color);
}
.site-toc li ol,
.site-toc li + li{
  margin-block-start: .5rem;
  margin-block-end: .5rem;
}
.site-toc li details summary{
  margin-block-end: 0;
}