R1:fa5a5a0a1235

Make the paste creation form work on phones

Summary:
This is the first time I've ever had CSS actually work like it promises it does (i.e., markup the "right" way and then you don't have to change the markup later).

Since I laboriously laid this whole thing out with <divs> originally, I was able to just override some of the styles and make the layout reasonable for devices.

The only differences for existing forms are:

- No colon after labels (looks cleaner anyway).
- Non-error required text is no…