activeWindowCls: 'ux-desktop-active-win'

I was wondering if anybody could cast some light on little problem that i just can't seem to resolve, I have an outer glow on the "Active window" in a desktop layout and would like to remove the glow whether the window is active or not, however i don't seem to be able to find the class and wondered how to override this and make it transparent/invisible?

Many thanks in advance,