Yes it can but you need to know CSS.

Any HTML site can be "converted to CSS, but as the previous poster said, you have to understand CSS to do it effectively.

Personally, I'd suggest that if you are going to that extent, that you have the site recoded in clean HTML...which Front Page does not produce. It will ensure that your sites looks right on most, if not all browsers. FP having been built around MS specific code, is not fully compatible with some browsers and the pages fall over when viewd on some browsers.

Alex