tasks #7144 avatars are very small on tuleap.net (cardwall view)

This tasks is part of story #6003 be able to change the Experimental theme color

* Move css rules in FlamingParrot part (override)

Change-Id: I26435fa5a977edf81bd0417c0d1993ab970cf7ce
Merge commit 'refs/changes/12/2712/2' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7144 avatars are very small on tuleap.net (cardwall view)
This is Tuleap 7.2.99.15

Change-Id: Icf468fd7f4fe475bfbb555ab1be64587b505bbad