Scrolling css background

Demonstrating a scrolling background image within an inner div.

HTML

<div id="library_tracks">
    <div id="content"></div>
</div>

CSS

#content {
  overflow-y: scroll;
    height:100%;
    background-image: url('http://farm5.static.flickr.com/4056/4228935406_93ff14c971.jpg');
}

#library_tracks { 
  height: 50px; 
  overflow: scroll
  
}