Amazing UX design. These Dropbox designers have really stepped up their game. Try resizing the browser window or submitting a blank form. It's the little things that matter.
Why does the text disappear and then reappear at the top, seems like anti-UX
Also their font is not very legible.
Unfortunately, this page also seems to cause Chrome's rendering engine to consume a full core on my machine to run. I'm not sure if that's Chrome's fault or the page's fault, though.
Poor contrast with small type is not cool. The resizing is neat, I guess.
Nearly a meg for a paragraph-long event invite!