If you got a text editor that shows line numbers (like JEdit, Notepad++ among other) then the line you want is 2803
Replace 2803 with
Code:
f:SetBackdropColor(24/255, 24/255, 0)
If you also want to get rid of the colored title bar and make it transparent then replace 2802 with:
I really wish the Violation devs would build this option to into the mod as it is annoying to go back and hack the mod every time it updates.