WP e-Commerce Grid View LITE CSS Question

I am starting to set up the store for one of my sites using the WP e-Commerce Grid View LITE plugin. All works fine, but I wanted to tweak some of the grid’s appearance (remove the border and center the image, text and “buy me” button over each other)… only problem is that for the life of me I can’t locate the css to change it. Any ideas of where that might be?

Site: liskabora.com

Thanks!