Mobile Navbar Wordpress Mystile Theme Issue

     

I am having a issue with the navbar on the child theme using the Mystile theme. When on a mobile phone the nav bar turns into a square box that you click on to acess the navbar for some reason it appears ontop of the logo I just can't figure out or get any CSS to make it go to its own line. I am hoping someone can help here.
  Website: http://test.cyberglide.co.uk