help styling sidebar lists

Is there anyone who can give me a hand with this css styling issue?

I am using the custom menu feature on these pages:

http://yesnodesign.com/1-iridescent-16-x-22-oil-on-canvas-1990/

I want to style the top level of each list to be bold and I cannot figure out how to do this!!!!

I can either get it all bold or none no matter what I try.

Any help would be greatly appreciated.