fix dual topnav responsive-ness - learn something new every day

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
use Sonat's css for colours and heights of the navs to make the spacelab theme look the same

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)