body {
	margin: 0;
	padding: 0;
	background-image: url('background.png');
	background-size: 100% 100%;
	background-repeat: no-repeat;
	background-attachment: fixed;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	position: relative;
}

.overlay{
	position: fixed;
	left: 15%;
	top: 0;
	right: 15%;
	width: 70%;
	height: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: white;
}

header, main, footer {
	z-index: 1; /* content appears above the overlay */
	width: 70%;
	right: 15%;
	left: 15%;
}

header {
	text-align: center;
	color: #333;
}

main {
	text-align: center;
	color: black;
	padding: 20px;
}

h2, h4, p {
	text-align: left;
	margin-left: 5%;
	margin-right: 5%;
}

footer {
	text-align: center;
	color: #333;
	padding: 10px;
}