<html>
  <style>
    body {
      font-family: Roboto;
      font-size: 50px;
      font-weight: bold;
      color: white;
    }
    #green {
      background-color: green;
      margin-top: 50px;
    }
    #blue {
      background-color: blue;
      margin-top: 50px;
      width: 50px;
      height: 50px;
    }
  </style>
  <body>
    <div id=green>
    	<span>Hello World</span>
    	<div id=blue></div>
    </div>
  </body>
</html>