Site too wide for mobile

Site URL: https://ray-cone-ap64.squarespace.com/config/

Looking for help....when in mobile preview I dont want a horizontal scroll anywhere on my site when it comes to a simple page. Larger Gallery images arent so much of a problem at this stage.

Can someone help me with how to move the hamburger?? to within the fame please? Thanks 

Add to Design > Custom CSS

@media screen and (max-width:767px) {
html, body {
	overflow-x: hidden;
}
}