Code Colors

If it’s here, I’m missing it. What does it mean when the code is in red? Most of my style rules are colored in green, black, and blue when I look at them in the advanced code editor. The rules I am playing with are the ones that are displaying in red. I’m thinking this must be part of my problem.

Any help you can give me would be greatly appreciated.

https://wordpress.org/plugins/advanced-code-editor/