How to Make profile Nickname font bigger

How do I make the Nickname font on a users profile bigger?

you can try to use Fire Bug - with Fire fox to resolve this problem.

Regards
Artur

there's no CSS file?

of course there are lot of css files. And fire bug will help you to find in which exactly file and in which line you need to make changes. So next time you will be able to make it easy and yourself.

Regards

Artur