This post refers to the white-on-black, blackboard design initially proposed in Design for Physics-SE. This design was withdrawn and (after a spell back in site-beta design) replaced with the current one, which first appeared in New Site Design.
Why do I still see the "beta" CSS?
I'm not seeing the styling that would indicate that this site is out of beta, I've tried hard refreshes, and using browsers that I've never used before.
Was the design actually launched, or not?