Help with Future_Zen and sideboxes (left)

First post here. Please move if I am in the wrong forum area.

I installed the future_zen (nice looking template by the way) and everything looks fine with 1 exception.

The front page of my store looks awesome, however when someone adds something to the cart, thus the shopping cart appears on the left, the boxes on the left merge together. Looks weird.

Here is my site. Please add something to the cart and on the left hand side of the page?

http://www.pcappliances.com/index.php

Thanks for your help