how to style the like-box

How can i style the like box provided by the fb_social module?

This morning I found this tutorial (http://line25.com/tutorials/how-to-add-a-custom-facebook-like-box-to-you...) and I was inspired to style my own like box created by this module, but I couldnt make it. Can somebody help me by telling me how to style it?

Firstly I tried it, by "hacking" the module adding
css="<?php bloginfo('stylesheet_url'); ?>?1
within the fb_social_likebox.module to
<fb:like-box ' . $attrs . ' css="<?php bloginfo('stylesheet_url'); ?>?1></fb:like-box>

but this didn't work.

Then I tried to grab the divs by ids and classes within the iframe and style them, but I could not manage anything.

Is there a special hook, trick or procedure?

Thanks in advance and greetings from Germany!
Maria