devdocs/assets/stylesheets/pages/_phpunit.scss

._phpunit {
  h1 {
    margin-top: 0;
    @extend %lined-heading;
  }

  h2.title {
    @extend %block-heading;
  }

  .programlisting > pre { white-space: normal; }

  .literal {
    padding: 2px 4px;
    color: #c7254e;
    background-color: #f9f2f4;
    border-radius: 4px;
  }

  div.warning { @extend %note, %note-red; }
}