Gallery2 font size problem

I’ve just installed the Gallery 2 WP plug in on my blog here:
http://hannahmontanazone.com/gallery problem with this is that the font is a lot smaller than it is in my default gallery2 installation directory that is not connected to the WP blog: http://hannahmontanazone.com/gallery2/main.php

How can I fix this difference in font size ?

I know I could play around with the theme.css file but there must be an easier way to ensure proper conversion surely ?