There is a tutorial in the forum (or was it an article) somewhere for creating a design package, this is probably what you'll want to do. At least there is a article on how to style webin, it's a bit old, around 2-3years, but should still be valid: http://ez.no/developer/articles/how_to_skin_an_ez_publish_now_site
Webin is not 1 single template, so you should adjust the css you got there for webin html instead of the other way around. Reason is that you might have to change a lot (templates and css) of stuff if you use the html from the design you got there.
