Per #188 (comment)
There is some cropping of the color pickers at 640 where the panel floats slightly off screen. Not sure if that is fixable, or even worth fixing. Stuff doesn't start breaking until around 620px wide, where the "B" text input disappears off the right edge.

Similar stuff happens (to lesser degree) for the "Toolbar Icons and Text" color picker on the left side of the UI, were the "Hex" text input and color chips float slightly off the edge, but is still usable:

Probably the most problematic is the Theme Texture picker, since it causes some horizontal scrollage.

