I have a CSS problem with this page: https://www.rules-chess-strategies.com/en/chess-blog

I found in code how to change the color and added this extra CSS to CSS file.

However this code is not working. Please advise.

It is a code from another component but the problem is that I use themis template and page builder. Normally it should allow me to add the code but technically it's not working.

you can see the pictures:

https://ibb.co/w7XyG2Q https://ibb.co/LPgKwyZ