Board Thread:Support Requests - Designing Your Wiki/@comment-25554800-20170625100255/@comment-24014422-20170625101954

Well, if you are talking about the color of the words displayed on buttons, there is actually a class that controls all buttons that were unaffected by the header to change all their words' color. There is also one for the drop-down menu buttons that rules them all.

But, if you are also trying to change the header buttons' forecolor via custom css, then I'm not sure if it is an appreciated move by the Staff.