Formatting help required - phone view page is too wide

Hi, could I get some help with a formatting issue please? I’m building a new site for my band, and at the moment the page doesn’t quite fit properly on a vertical phone, you have to scroll right to see the menu hamburger, then left to see the menu items. Sure it’s something simple, still learning Wappler.
http://gloom.band/
Thanks for your help. Note this site is a work in progress, links not working yet etc.