Publish pane scrolling

This should get rid of the orange bar at the bottom when on large ish screens.

The main content that was scrollable was a grey div on top of an orange div that was static. Grey div was down 50px to make it look like there was an orange header, but was actually just the orange background showing through.

Now the grey div has no background, the orange background is now grey and shows through, and I added an orange div in the top to replace the pseudo header, which I feel is much more clear.

I also snuck a cursor on the close button.