Can you change the color of a font to blue or white? thank you

I really like this theme ♥ and absolutely do not want to change it for any other! It's beautiful!

Can I take a few notes? In case you want to refine the theme, but it's great as it is.
The new browser update has messed up the theme a bit by adding a gray line.
And when you open an extra small window (when paying, or when displaying the twitch chat in a separate window), a white bar appears at the top.

Friend your theme is great .. To be perfect...Dark style Pop-up ,Grateful!