.header-reference{
    background-image: url('../images/header/header-reference.jpg');
			background-position: center;
			background-size: cover;
			background-position-y:-30px;
}

@media (min-width: 410px) {
	.header-reference {
			background-position-y:0px;

	}
}


@media (min-width: 700px) {
	.header-reference {
			background-position: center;
			background-size: cover;
	}
}