Starting with SiteMap 0.84 the sitemap is now "div wrapped" with a
This lets you do some interesting things. A great resource is Listamatic which shows some nice examples of what's possible.

To enter custom CSS go to the page inspector (Apple-i) and click on the advanced tab.

Starting with SiteMap 1.32U each item is now given a unique class ID based on the page type. If the page type has a space it's converted to a dash so "Styled Text" becomes "Styled-Text". Blog's entries are always called "blog-entry" or "blog-archive" (for both built in RW Blog types as well as RapidBlog)