Hi Josue
I actually managed to fix the issue by adding some quick css to make the text black on the tooltip, but you can see the issue on the theme demo if you go to the contact page http://kriesi.at/themedemo/?theme=enfold and select the black theme?

I looked into the CSS for the actual tooltip box, but it looked a little complex so was happy enough just to switch the font color.

Cheers :)