Drop-down Menu Behind Content

Hello All,

Working on a new site here: http://www.tracksandtrailsmuseum.com/ and cannot find a work-around for the drop-down menu, which keeps winding up behind the content.

I have looked at dozens of other support threads and changed the z-indexes and removed “overflow: hidden” in multiple locations with no avail. If anyone can see a solution that I’m missing, I’d be much obliged. Never had this problem before; feel like this should be a simple fix.

Thanks.