Change background color for the selected tab on konsole

Hi, I'm trying to change the background color of the tab bar of Konsole instances for the selected tab. In doing research I find that making a QtabBar.css file and asking Konsole to use it. I don't see where it would be placed in the filesystem and how to tall Konsole(s) to use that file. Could someone help me with this please? Regards, George... QTabBar :: tab : selected { background : #999999 }QTabBar :: tab : selected { background : #999999 }