Little problem changing RSS icon

[Alucard^]

I think the problem is not very hard to solve it, but i can't found the way.

I changed the RSS icon in forumbits but looks like this:



The image is not complete... so ofcourse is a problem of dimension (height attribute)... but, where is the code or how can i change the dimension of this? i can't found it... i tried in forumbits.css but the only thing is this:

PHP Code:

.forumactionlinks .rsslink {
    background-image:url({vb:stylevar imgdir_misc}/rss_40b.png);
} 


Thanks and sry for my english.