CSS Loop in text color? See Images

Hi,
Thnx to JamesD, i’m getting a real “hold” on my CSS task’s (better late than never)
However, I am running into a funny loop.

If I want the to override the Blog Text Color in #3C94F2 (blue) -> automaticly it also turns my text in the same color on the product info box.

If I turn the product info box text to color #FFFFFF -> it turns my Blog text box in white also.

I want to have my Blog Text #3C94F2 (blue) and my product description box in #FFFFFF

See images.

How to I handle this?

Thnx a lot for your help!