body { 
	background-image: url(https://debussytrio.com/wp2/wp-content/uploads/2015/01/Seated-Trio-e1555182081204.jpg);
	background-repeat: repeat;
	background-size: inherit;
	background-position: center top;
}
#pusher { 
	opacity: 1;
	background-attachment: fixed;
}

.side-menu,
.nav-menu .sub-menu,
.nav-menu .children { 
	background-attachment: fixed;
}