  #s, #f {
    inline-size: 40px;
  }
  #bp, #ww {
    margin-inline-end: 20px;
    margin-block-end: 20px;
  }
</style>
<body>
  <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
  <section>
    <div id=bp>Black Panther</div>
    <div id=ww>Wonder Woman</div>
    <div id=s>Storm</div>
    <div id=f>Flash</div>
  </section>
</body>
