Tried using CSS?
Personally i prefer to code the entire xHTML/HTML output myself. Assign classes and use an external stylesheet. I'm not sure if this is how ASP.NET 2.0 does things, but ASP.NET 1.1 used embedded styles in attributes which sucks for many reasons.

I did an ASP.NET application for my college assignment without any user interface problems. I recommend previewing in Firefox first, then IE. From experience, IE first just leads to alot of broken layouts in other browsers.