html,
body {
	background-attachment: fixed;
	background-position: 50% 50%;
	background-size: cover;
	margin: 0;
	padding: 0;
}

.black {
	background-image: url("../img/bg-black.jpg");
}
.dark-blue {
	background-image: url("../img/bg-dark-blue.jpg");
}
.blue {
	background-image: url("../img/bg-blue.jpg");
}
.purple {
	background-image: url("../img/bg-purple.jpg");
}
.dark-red {
	background-image: url("../img/bg-dark-red.jpg");
}
.red {
	background-image: url("../img/bg-red.jpg");
}
.orange {
	background-image: url("../img/bg-orange.jpg");
}
.green {
	background-image: url("../img/bg-green.jpg");
}
.yellow {
	background-image: url("../img/bg-yellow.jpg");
}
.white {
	background-image: url("../img/bg-white.jpg");
}