Supposing I\'m setting a background image for a web page in CSS like this:
body { font-size: 62.5%; /* Resets 1em to 10px */ font-family: Verdana, Arial, Sans
In short, it's not possible. You can do this, but you need to add a second HTML object to the page to get it to work. So for example, place a div block right below your body, and assign the second background to that object.
Hope this helps!