Please see my comment to the question. This could be just yet another style. (Not sure if such style is a really good idea, by the way.) And for styles, you just need to learn this:
http://en.wikipedia.org/wiki/CSS[
^] :-).
The smile above is written on purpose. I do understand that, in the context of your question, "style" should be considered in its wider sense, with more advanced behavior then flow of contents, layout and colors. But it cannot be a matter of just one Quick Answer. And not a matter of just one manual. You would need a manual on the whole Web development topic, including ASP.NET. Big part of it would be learning of Javascript.
—SA