body,
html {
	height: 100%;
	margin: 0;
}

.iref {
	background: url("../images/iref-mobile.png") no-repeat center center fixed;
	height: 100%;
	background-size: cover;
}

@media (min-width: 481px) {
	.iref {
		background-image: url("../images/iref-desktop.png");
	}
}