How to set text color of all text in central widget?

[Niagarer]

Hey,
I want to set the textcolor of all actions, buttons, Groupboxes etc. etc. in my main window to white.
I tried it with the palette of the central widget (and main widnow and also single buttons) in the designer but that does not change anything. The text is still black.
How can I change that?
Thanks for answers

[Niagarer]

Oh, found it!
I just had to add

color: #ffffff

to the stylesheet of main window

[ODБOï]

color: "#ffffff" *