Alright.

I completely understand HOW to make this background effect work, in a standard HTML site. Ive done it on a number of different sites. The links were not just sites Im trying to copy they are my designs.

What I really need to know is detailed information about where in ZenCart do I go to do this? What file should I be editing to put a div before and after the store? Where does the store start? where does it end? I ask this because Im assuming I need a div for the left shadow, one div for the bottom shadow and one for the right shadow. This also leaves the question of how do I make the corner shadows accurate if Im not using tables?

Thanks again