[Bugfix] Fix navBar zIndex #trivial  (#2559)
[Bugfix] Fix navBar zIndex #trivial  (#2559)

[Bugfix] Fix navBar zIndex #trivial 
artsy/reaction,xtina-starr/reaction,artsy/reaction-force,artsy/reaction,xtina-starr/reaction,artsy/reaction,artsy/reaction-force,xtina-starr/reaction,xtina-starr/reaction