Judging from all the positive comments in this thread, clearly I must be missing something. This looks horrible to me. Instead of meaningful CSS classes you just get a bunch of small classes that do very small things, which you're supposed to combine until it looks like what you want. How is that better than writing your CSS manually?
(Again, I realise the failure is probably on me. But I don't get it.)
(Again, I realise the failure is probably on me. But I don't get it.)