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<html>
<body>
<div style="width:300px; height:300px; position:absolute; background-color:green; -webkit-transform:rotate(-30deg)translateZ(0); left:200px; top:100px;">
  <div style="width:250px; height:250px; overflow:scroll; margin:25px; opacity:0.5;">
    <div style="width:10000px; height:10000px;"></div>
    <div style="position:fixed; left:0px; top:0px; width:50px; height:50px;background-color:red;"></div>
  </div>
</div>
</body>
</html>