type on your web content accessability guideline

Dear W3's,
what's the name of the type you used on your page Web Content Accessibility Guidelines? It looks nice and clean and seems appropriate for longer web documents such as handbooks or so. I couldn't detect it as the name seems to be hidden in a style sheet. Can you helb me?
Kind regards
Margo Bargheer
State University Goettingen, GErmany