SSP-2414 More Sinclair-ish portal footer styling, but sans black bg

Decided the shorter footer made sense b/c it meant less chance of
accidentally scrolling large portions of the SSP UI off the screen
just to end up looking at a large, most blank swath of "footer".
Still didn't like the short band of black floating in the middle of
larger browser resolutions during login, though, so I removed the
black background style.