devdocs/assets/stylesheets/pages/_yard.scss

._yard {
  > h2 { @extend %block-heading; }
  .signature { @extend %block-label, %label-blue; }

  > .method_details {
    padding-left: 1rem;

    > .signature { margin-left: -1rem; }
    > .signature .overload { display: block; }

    h3 { font-size: inherit; }
    ul, pre { margin: 1em 0; }
  }

  .tag_title { font-weight: bold; }
}