Modifying 'Sport' skin


I am relatively new to cs cart, and have been messing around with it for the last few days. I think I have got the hang off it, but creatin skins is proving to be a slight problem. I have been trying to modify the ‘Sport’ skin that is available when you install cs cart. One of the problems I am having is trying to change the color scheme for the ‘Categories’ menu on the left hand side of the page. I manged to change the color from red to blue, but am unable to change it anymore. I am just wondering, or those ‘on hover’ images that I would have the change the color, or is there something I am missing? All help will be greatly appreciated.