position-fixed-2-ref.html

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<!DOCTYPE HTML>

<html>

<body style="overflow:hidden; height:3000px">

  <div style="position:absolute; top:-25px; left:0; width:100px; height:200px; background:yellow; z-index:1"></div>

  <div style="position:fixed; background:blue; top:0; left:0; width:200px; height:100px">

    <div style="position:absolute; background:cyan; top:40px; left:0; width:50px; height:300px;"></div>

  </div>

</body>

</html>