Change CSS to the cart and customer account tables

I was wondering where I could find the CSS file so I can make some style changes to the two tables I mentioned in the subject field. The current styles are not consistent with my website. I'm trying to remove the border, add a tint to the cells and add some padding??? image missing http://www.hikashop.com/media/kunena/attachments/legacy/images/Picture_2-20111110.png

The front end CSS file of HikaShop can be edited via the tab Display of the configuration of Hikashop.