Main Menu (Sticky) on Mobile

For some reason, the main menu gets hidden behind the slider and is not visible on mobile devices. Please see attached picture with yellow highlight.

http://x4h.388.myftpupload.com/

Hello there,

Try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    .sydney-hero-area {
      z-index: -1;
    } 

Regards,
Kharis