title: Scaling background images to fill browser window with centering and aspect ratio
body: <p>I know there is a lot of information out there on this but I've searched and searched and still have not found the help that I need.</p>
  
  <p>Essentially I'm trying to fill the entire browser window with a background image that scales itself and retains it's aspect ratio automatically at any size so that it can be viewed on any device.</p>
  
  <p>Here is an excellent example of what I am trying to achieve:</p>
  
  <p><a href="http://www.comme-des-garcons.com/rawvision.html" rel="nofollow">http://www.comme-des-garcons.com/rawvision.html</a></p>
  
  <p>The background image, when sized to 320x480 then stretched from 480 to 640 expands itself to the right!</p>
  
  <p>If anyone out there can shed some light on how this is achieved via css I would greatly appreciate it!</p>