You might want to take a look at the guides for changing the css / style of ezwebin, 99% also applies to ezflow*:
http://ez.no/doc/extensions/website_interface
http://ezpedia.org/wiki/en/ez/overriding_the_ez_web_interface_ezwebin_with_custom_designs http://ez.no/developer/forum/setup_design/ezwebin_multiple_domains_and_different_designs_for_each/
* ezwebin (Website Interface) and ezflow are the packages you select while installing