Best way to style a web app in diffrent ways

Hi Guys. 

I try to writa a web app where it is possible to give diffrent styles to them. 

Whart is the best way to do this. 

At the moment I'm trying to do this with CSSResource. But this don't work so good. 

I would do it with a normal css but I have no idea how to style default GWT Styles like a CellTable ?

Any hints ? 

Thanks in Advance

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