devdocs/assets/stylesheets/pages/_git.scss

._git {
  > h2 { @extend %block-heading; }
  h3 { font-size: 1rem; }
  > .callout, > h1 + .sectionbody { @extend %note, %note-green; }
  code { @extend %label; }
  em { font-style: normal; }
}