fix navbar search in some browsers by defining his height
fix navbar search in some browsers by defining his height

NicolasAndersen/materialize,ra-tes/style-guide,philipraets/materialize,digitalkaoz/materialize,ManuZiD/materialize,DonHartman/materialize,ZiperRom1/materialize,devgrok/materialize,rlugojr/materialize,mihaibogdan10/materialize,tomscholz/materialize,ccloli/materialize,rlugojr/materialize,zhenhua32/materialize,gokuldh/materialize,ZiperRom1/materialize,NicolasAndersen/materialize,Dogfalo/materialize,tangposmarvin/materialize,hustcer/materialize,DonHartman/materialize,tomscholz/materialize,ra-tes/style-guide,digitalkaoz/materialize,mihaibogdan10/materialize,tangposmarvin/materialize,josecarlosweb/materialize,devgrok/materialize,gokuldh/materialize,ccloli/materialize,INGCRENGIFO/materialize,INGCRENGIFO/materialize,ManuZiD/materialize,zhenhua32/materialize,josecarlosweb/materialize,Dogfalo/materialize,philipraets/materialize,hustcer/materialize