<!DOCTYPE html>
<html>
<head>
  <title>CSS Background Test Reference</title>
  <link rel="author" title="schenney" href="mailto:schenney@chromium.org">
  <style>
    span {
      background-color: green;
      display: inline-block;
      height: 60px;
      width: 60px;
      border: 5px solid green;
      border-radius: 5px;
      box-sizing: border-box;
    }
  </style>
</head>

<body>
  <span></span>
</body>
</html>