[Plugin: Flickrpress] customize CSS

Hello.

Thank you for this great plugin, I have installed Flickrpress and the only settings that work is the RSS type, which is fine for me because that is what I wanted. 🙂
Now I would like FP to publish my feed in a page with square thumbnails but much bigger than the ones automatically displayed…

What should I change where to get a 200px square thumbnail size ?

Anyone knows ?

Thank you in advance

http://wordpress.org/extend/plugins/flickrpress/