mod_custom suffixed menu

I am trying to change the font size of the mod_custom suffixed _menu content. Where can I find the size control or may I say, how can I change it?

Thanks

this deals with customization..

Well, a little of direction would have helped. I didn't think it was too much to ask!

Hi

Please use Firebug. This is a plugin for Firefox which will easily tells You which file and line to modificate to have fonts changed.

Your information was more than helpful, thank you.
For those who might have similar issues, you can do the change in joomla.css line 279