Theming a Facebook Button with potentially Off-site Code?

This isn't using a WPMU plugin, but I thought someone here might have a quick and easy answer for me.

I'm using WP-FB Autoconnect to put a login/create account button on the top of my site's sidebar. The issue is sizing. I can fix it on screen with Firebug, but can't figure out a way to get to the code that handles the size of the text in the button... I think it's on Facebook's end, but there has got to be a way for me to mod it on my end... right?

Thanks either way.