How can I get the Shopping Cart in the Widget Area to display properly?

I'm having a problem with the way the Marketpress Shopping Cart widget is displaying in the sidebar widget area on one of my merchants sites within my multisite network.
I've tried looking in the grid.css file and I changed the width of the sidebar from 240px to 280px, but the Shopping cart is still being cut off. I also tried looking in the framemarket.css file, as well as the marketpress.php file, but still nothing.
Maybe I'm looking in the wrong area but can some please tell me how I can fix this issue and make it look more clean?
Please view the screenshot of my problem.

Thanks in advance.