layouting

Previously, when the pages had a height
smaller than the screen's height,
the footer was displayed somewhere in the
middle of the page.

Display the footer at the bottom, with
no whitespace after it.

- Make footer full width and put it at the bottom.
- Replace light blue bar below the navbar
  with white bar, to match the bar above the footer.

Make the "Search" button fit in more with
the other navbar items.

Weitere Anpassungen für Login Menu
Including Navigation Menu