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chromium/chrome/test/data/print_to_pdf/basic.html 

<html>
  <title>PrintToPdf Basic Test</title>
  <style>
    #centered {
      position: absolute;
      top: 50%;
      left: 50%;
      width: 200px;
      height: 200px;
      margin-top: -100px;
      margin-left: -100px;
      background-color: red;
    }
  </style>

  <body onload="SetBodyStyle()">
      <div id="centered"></div>
  </body>

  <script>
    function SetBodyStyle() {
      document.body.style.color = '#ffffff';
      document.body.style.background = '#123456';
      document.body.style.height = '50 in';
    }
  </script>
</html>