title: scroll to top not working inside absolutely positioned div
body: <p>My problem is that I have a "scroll-to-top" anchor which it's not working when I give to its parent the following styles:</p>
  
  <pre><code>background:url('http://wallpaperlepi.com/wp-content/uploads/2014/10/White-Dog-And-Glasses-Wallpaper-HD.jpg');
  background-position: fixed;
  background-repeat: no-repeat;
  position: absolute;
  left:0;
  top:0;
  right: 0;
  width: 100%;
  height: 100%;
  overflow: scroll;
  </code></pre>
  
  <p>If I remove position absolute and <code>background-position:fixed</code>, it works. Can anyone explain why is this happening? I really need to preserve those styles. Thanks! 
  Here is the <a href="http://jsfiddle.net/e4uq0jsu/2/" rel="nofollow">jsfiddle</a></p>