Forum:Quartz skin syntax for changing wide logo?

I have a wide logo that is loaded as Wiki_wide.png and looks ok with light value backgrounds but looks unprofessional on the dark backgrounds. How do I override in my quartz css? BTW- what are the names of the css's? Mediawiki:Quartzslate.css works, but changing Quartzsapphire.css and so on for the other quartz variants does not appear to have any affect. ~  Ph l o x  23:27, 30 November 2007 (UTC)