/* TOC 固定在右侧 */
article aside.w-30-l {
  position: sticky;
  top: 1rem;
  align-self: flex-start;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

/* TOC 层级缩进 */
#TableOfContents ul ul {
  margin-left: 1em;
  margin-top: 0.25em;
}

#TableOfContents ul ul ul {
  margin-left: 1em;
}