z-index fixes for position fixed header
z-index fixes for position fixed header

tkadlec/lighthouse,GoogleChrome/lighthouse,mixed/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,tommycli/lighthouse,tkadlec/lighthouse,ev1stensberg/lighthouse,wardpeet/lighthouse,umaar/lighthouse,tommycli/lighthouse,umaar/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,cedricbellet/lighthouse,mixed/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,cedricbellet/lighthouse,wardpeet/lighthouse,arturmiz/lighthouse,GoogleChrome/lighthouse,GoogleChrome/lighthouse,arturmiz/lighthouse,tommycli/lighthouse,arturmiz/lighthouse,tommycli/lighthouse,tkadlec/lighthouse,cedricbellet/lighthouse,GoogleChrome/lighthouse,tommycli/lighthouse,cedricbellet/lighthouse,mixed/lighthouse,umaar/lighthouse,ev1stensberg/lighthouse,deepanjanroy/lighthouse,arturmiz/lighthouse,ev1stensberg/lighthouse,ev1stensberg/lighthouse,arturmiz/lighthouse,cedricbellet/lighthouse,tkadlec/lighthouse,mixed/lighthouse,deepanjanroy/lighthouse,GoogleChrome/lighthouse,umaar/lighthouse