messages: div in messages menu fix

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>
base: absolute icon font path

* Forcing the font path to be absolute. Otherwise less.js is confused,
  the problem doesn't occur when the stylesheet it compiled though.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reported-by: Jan Åge Lavik <jan.age.lavik@cern.ch>