After trying everything I could find via FireBug, I still can't find a way to change the CSS for the background color of a horizontal menu set which uses the Nice Menus module. The menu is inside a custom region with a custom background color, but always picks up the overall page background color. It acts as if it's a window to the page background, and changing the page background in theme settings will change its color. The theme being used is MAYO. Thanks for any suggestions.