Hello @Tobias_Andersson_Gid, and welcome!
Don’t hesitate to read How to post in the Questions category, and add a small example that shows your current progress, or images of the desired output, so we can help you better.
Have you perhaps looked at Build Your Own Theme | Touying? Touying uses a specific utility function to configure colors, to be set in the touying-slides function. Hope that helps,