<!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 {
        border: 1px solid gray;
        width: 300px;
        height: 300px;
      }

      .inner {
          width: 100px;
          height: 100px;
          background-color: green;

          position: relative;
          left:100px;
          top:100px;
      }
  </style>

 </head>
 <body>
  <p style="margin-top:70px;">You should see only one green area, no red area.</p>
  <div class="container">
      <div class="inner">
      </div>
  </div>

</body>
</html>