How do I add an image as background?

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Linda, 

First off, let me say thanks for the hard work you have done. It is a truly remarkable piece of work.

With that said, I am trying to add an image as the background of the store and can't figure out exactly where to add it. I have successfully added the image to the header but not the main body of the page. Can someone please point me in the right direction? Is it in the stylesheet or in admin?

Mike