nav.post-toc {
  margin: 1.5em 0;
  padding: 1.25em 1.5em;
  border: 1px solid currentColor;
  border-radius: .25rem;
}

.post-toc__title {
  margin: 0 0 .75em;
  font-weight: 700;
}

.post-toc__list,
.post-toc__sublist {
  margin: 0;
  padding-left: 1.5em;
}

.post-toc__list {
  list-style: decimal;
}

.post-toc__sublist {
  margin-top: .5em;
  list-style: lower-alpha;
}

.post-toc__list li + li,
.post-toc__sublist li + li {
  margin-top: .35em;
}