Can someone help me identify a style (class)?

I have been searching for the style that is controlling the "red" hover on the thumbnails in the "Latest from the Blog section" on my theme - demo here:

http://themeforest.net/item/florida-premium-multipurpose-responsive-theme/full_screen_preview/6609201

It's driving me crazy!! I thought it was class="img-hover" or maybe class="img-hover:before" and nothing still that red.

Any ideas? I'd be so grateful!