devdocs/assets/stylesheets/pages/_less.scss

._less {
  padding-left: 1rem;

  > h1, > h2, h3, h4 { margin-left: -1rem; }
  > h2 { @extend %block-heading; }
  h3, h4 { @extend %block-label, %label-blue; }
  code { @extend %label; }
}