altering Tropical style?

[wembley]

So, I had a Mixwit Theme layer, and I knew how to mess around with its CSS (a little, anyway), but I decided to change my layout to Tropical (Summer Holiday). Any italicized word in my entries are now colored blue. I want to change that, but I can't figure out how to get into the CSS. Help? (Apologies if this isn't on-topic for the comm, or if this is a really stupid question.)