Font size of menu/drop-down

I use Catch Base Pro, and I have about 2 hours of experience of CSS... I would like to increase the font size of the menu. This I have achieved in "additional CSS" by adding: .menu { font-size: 18px; } This took care of the menu (top level), but the drop-down items are still small. How do I modify the dropdowns? Site: www.ooof.nu