How to change colors

Hello,

I’m using GamePress for my website https://www.dailynintendo.nl and I have 2 questions:

– when I make the background white, how can I change the color of the tekst in the right column? Those text is now white and on a white background unreadable

– how can I change the black color on the upper site where you see also the header? And how to change color of the news blocks?

Thnanks in advance and sorry for my bad English!