devdocs/assets/stylesheets/pages/_coffeescript.scss

._coffeescript {
  @extend %simple;

  // CoffeeScript / JavaScript code blocks
  > .code {
    margin: 1.5em 0;
    overflow: hidden;

    > pre {
      float: left;
      width: 49%;
      margin: 0;
      @extend %border-box;

      &:last-child { float: right; }
    }
  }
}