[gnome] Looking for info on making a theme.

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http://ubuntuforums.org – I'm trying to make some new themes. Unfortunately I can't find any information via google. Perhaps I suck an coming up with search terms. What I'm looking for is an explanation of the *.css files. There seems to be features in them that goes beyond what I've learned messing around with web pages. I don't understand the things like: Code: color: shade (@bg_color, 0.6); text-shadow: 0 1 alpha (shade (@bg_color, 1.25), 0.5) what are these -unico values? And in lines like: Code: GtkComboBox.combobox-entry .button, .button:active, .button:insensitive{ are all buttons, (Hardware)