Burger menu on mobile version

Site URL: https://www.xn--gteagency-f3a.dk/

Hi!

I used this guide to create a burger menu: https://ryandejaegher.com/how-to-add-a-desktop-burger-to-squarespace-7.1/ 

But when using this code, the menu disappears on the mobile version:
/* This will hide the desktop burger on mobile devices*/
@media (max-width: 767px) {
a[href='/burger'] {
display: none;
}
}

If I then remove the code, the menu says "Burger menu >" and when I click that I get to the actual menu (see attached photos). Can anyone help me, please?

Add this to Design > Custom CSS

@media screen and (max-width:991px) {
	.header-menu-nav-folder {
    transform: unset !important;
}
.header-menu-controls.container.header-menu-nav-item {
    display: none;
}
[data-folder="root"]>.header-menu-nav-folder-content:first-child {
    display: none;
}}

Omg, have been struggling for so long with this and now it works. THANK YOU!