Custom Mobile Menu background
Yep - add your own image to the menu background on a mobile:
// Your Own Mobile Menu Background //
.header-menu-bg {
background: url('https://images.squarespace-cdn.com/content/65f1c68b49cf6d6ffc986e2d/e192eb89-5de4-4a9f-a6d8-c3f961cf81aa/Batteries+Included+Customer+Success+Optimisation+Consultant+Mobile+Background.jpg?content-type=image%2Fjpeg');
background-size: cover;
background-position: center;
}