Menu Overlap – Responsive Menu Design Not Working

Hello,

I was wondering if you could take a look at my site http://www.sferikul.com on a mobile device. It appears that the main menu is overlapping big time (under music). I don’t mind just using a responsive (hamburger) menu on mobile device to get rid of that issue, but the issue is that I can’t get it to only show the hamburger menu on my mobile device.

Any help is much appreciated.
Thanks,
Abbey