Super clean typography. I like how the information about where your money goes overlaps the field where you enter it. Can't misunderstand anything there. The button is a strong call to action. The features are there filling out the space and not getting in the way. The page title is there in a tiny banner, because that's important but not nearly as interesting as the headline "Welcome Back to Peaceful Reading" and "You're 60 seconds away from a whole new web..." which is far more enticing.
*May or may not contain any actual "CSS" or "Tricks".