"add folder" and "upload file" icons too big

Hi,
I just installed this plugin and those “add folder” and “upload file” icons are ridiculously huge. I didn’t find any setting allowing to reduce their size. Here it’s how they look:
http://zeitgeistlab.ca/data/misc/icons.jpg
Does anybody know how to reduce them?
Thanks!

http://wordpress.org/extend/plugins/smallerik-file-browser/