Button size problem

Hi, I’m not sure which would have been a correct place for this question. I already tried in themes etc, but without any luck. Sorry if this is still in a wrong place.

I’m using WP 3.1.1 with Atahualpa 3.6.4. I installed Simple Facebook Connect plugin and put FB-like buttons in place. Now the problem seems to be that on source code (bellow) you can see, that in css the FB-like button goes into a contained that for me seems to be a fixed size 450x65px. The button only requires maybe 25px height, so there is extra 40px between every post on my page. How can I adjust the space allocated to this like button? I can not find any way to do that in configuration area, but I might just have missed the right place to do this.

— SOURCE CODE FROM FIREFOX —
<p class='fb-like'><iframe src='http://www.facebook.com/plugins/like.php?....' style='border:none; overflow:hidden; width:450px; height:65px'></iframe></p></div>
— END SOURCE —

[Please post code snippets between backticks or use the code button.]

Any help is highly appreciated.