Seem's like an issue has popped up on quite a lot of Byond blogs.
There was an issue.
I've spoken to Lummox about it and he said he's looking into it.
It was Fixed!
So yeah.. should be fixed in time.. just saying don't panic and try re-doing your CSS if it's gone faulty or you think it's been bugged or removed lol, it's just this issue so don't worry.
No need to worry anymore.