Problems with picture and alignment

I would like to remove or align the border around my product picture. I have found out how to remove it via the plugin’s style.css however after making all of the necessary changes to do what I want it says my .css is inactive and the changes do not show up. The page I am talking about is here http://supercocoachips.com/product/super-cocoa-chips-16oz/

http://ww.wp.xz.cn/plugins/ready-ecommerce/