<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Reference File</title>
  <link rel="author" title="Ebay Inc." href="mailto:xiatian@ebay.com"/>
  <style type="text/css">
      .container {
          height: 100px;
          width: 100px;
          background-color:#fff;
          border:1px solid black;
      }

      .transformed {
          position: relative;
          top:15px;
          width: 100px;
          height: 70.7px;
          background-color:green;
        }
   </style>

 </head>
 <body>
   <p>There is one green area in the box</p>
  <div class="container">
    <div class="transformed"></div>
  </div>
</body>
</html>