please provide a short guide how to do the tech part or you will scare most designers

where do we find the css file?
how do we test the css on the wallet?
will the css look the same on all OS or do we have to do different csss?
is it pure css or are there images/other files as well?
It's Qt's mods of CSS for their own system. Anoncoin can read custom css by using:
style=custom.css where custom.css lies inside the Anoncoin application folder where you find the wallet and the blockchain and the config file itself.