[gutvol-d] PG Examples of XHTML and CSS?

If I remember correctly, someone was creating PG texts using CSS and XHTML, but I don't remember who it was. I would like to see an example that uses these technologies. The W3.org website has all of the information, but sometimes it's like trying to find a needle in a haystack to find the answer to a specific question. If someone could provide the name of the poster or an e-book number, that would be very helpful. Thank you.