<html>

      <head>
  <style>
    body {
      background-color: #aaa;
      font-size: 200%;     
      padding:0.3em;
    }
    section {    
      background-color: #eee;
      padding:2em;
      margin:auto;
      text-align:center;
    } 
  </style>
</head>

      <body>
  <section>
                <h1>Running on Rack!!</h1>
  </section>
      </body>

      <script type="text/javascript">
    console.log(document.getElementsByTagName("section")[0]);
</script>

</html>