chrome vs. firefox diff
 

Hi,

I'm new to HTML/CSS and was hoping to get some help with the following problem I'm experiencing since yesterday:

In Chrome the thumbs aren't perfectly centered in their boxes (very slightly to the left). And when hovering over them, all the thumbs make a very little (barely noticable) jump to the right .. in order the get perfectly centered for a second and jump back to the left again. This identical problem occures on all pages containing thumbs:

http://www.gamanga.com/VideoGames.html
http://www.gamanga.com/Trailers.php
http://www.gamanga.com/ScreenShots.html
http://www.gamanga.com/VideoGames-ps3-ng3.php
...

In FireFox (Safari) ... all thumbs are perfectly centered. No issues or jumps here.

Chrome
http://imageshack.us/a/img37/319/exchrome.jpg

Firefox
http://imageshack.us/a/img607/6516/exfirefox.jpg

I dunno what I did wrong (I'm guessing I misplaces a comma or something somwhere?), but can't find the error ... could someone check the coding and help please?

Thanks already! :thumbsup: