body {
	font-family: Arial, sans-serif;
	margin: 0;
	padding: 20px;
	position: relative;
}
h1 {
	color: darkblue;
}
.watermark {
	position: fixed;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	font-size: 50px;
	color: rgba(0, 0, 0, 0.1);
	font-weight: bold;
	z-index: -1;
}
.header {
	text-align: center;
	margin-bottom: 20px;
}
.header img {
	width: 150px;
}