honey/css/Background.css

#background img {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	overflow: hidden;
	object-fit: cover;
	transition: transform .4s, opacity .4s !important;
}

#background.scaled img {
	transform: scale(var(--scale-factor));
}

body #background img {
	opacity: 1;
}

body:not(.dark) #background img:last-child,
body.dark #background img:first-child {
	opacity: 0;
}

body.dark #background:not(.scaled) img:first-child,
body:not(.dark) #background:not(.scaled) img:last-child {
	transform: scale(var(--scale-factor));
}

body.dark #background.scaled img:first-child,
body:not(.dark) #background.scaled img:last-child {
	transform: none;
}