green;
    height: 25px;
    margin-top: 50px;
    width: 100px;
  }
</style>
<body>
  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
  <div id="test">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
  </div>
  <div id="top"></div>
  <div id="bottom"></div>
</body>
