[ticket/11801] removed some whitespace and added missing semi colon's in css

PHPBB3-11801
Merge remote-tracking branch 'Prosk8er/ticket/11801' into develop-olympus

* Prosk8er/ticket/11801:
  [ticket/11801] removed some whitespace and added missing semi colon's in css
[ticket/11802] replace $browser with $user->browser

PHPBB3-11802