E-commerce with Special text boxes

Hi guys, first comment on this forum so go easy on me :), Im working on a new site, i have installed both the WP e-commerce plugin and the special text box plugin to try and make things look a bit nicer….

the problem im having is that im trying to put put the products of the shop within a special text box, it works fine while showing the product categories but then if i choose a category to display the list of products the box then remains the same small size but the products list over the edges of the box?

Hope ive explained it well enough…
any help would be great thank you