devdocs/assets/stylesheets/pages/_erlang.scss

._erlang {
  @extend %simple;

  h3 > code { display: block; }
  code.code { @extend %label; }
  .note { @extend %note; }
  .warning { @extend %note, %note-red; }
  .note .label, .warning .label { font-weight: var(--boldFontWeight); }

  .since {
	  color: var(--textColorLight);
	  font-weight: normal;
	  font-size: small;
  }
}