[Plugin: NextGEN Gallery] Help with using NextGen style sheet

I’m trying to add a custom “add to cart” button in the description area of an image thumbnail gallery. However, it is taking on the styles of the image thumbnail by adding a border around it.

In addition, I can’t get it to center, which is strange since the rest of the description is centered.

It looks like the button image is falling within the span tag. I have tried various tweaks to the NextGen style sheet, but with no results.

Here is the page link.

Any suggestions? I can’t use this if I can’t fix how it looks!

Thanks.