Font size in sidebar widget

I'm amazed that in just a few days I've managed to create a nice site and, thanks to Catchthemes and this forum, tweak it - with no previous experience and no knowledge of html or css (I'd never even heard of css!). Awesome :-) There's one tweak I haven't been able to do, in spite of trying several things I found in the forum archives - increase the font size of the Categories list in the sidebar (the actual list, not the list title) and the breadcrumb trail (which is the Breadcrumb NavXT plugin). At the moment I've got .sidebar .widget { font-size: 16px; } My site is vintagevagabonds.net