Colors of tabs

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Hi guys,

 

I have a small issue with the color of my tabs.
If you go to: www.maxifun.com you'll see the tabs that are "active" are in white on white.

Which isn't readable.
 

I've been able to solve the problem yesterday by going to the V85_37....file and change the color and background-color, but it only solved the issue for 1 day as it's a temp file in the cache.

 

I haven't found the place who's generating those cache files... to change the color permanently.
Can someone helpe me with this?

 

Thanks in advance.