html {
	height: 100%;
	font-family: Arial, sans-serif;
	background: #f4f4f4;
	margin: 0;
	padding: 0;
}

body {
	margin: 0;
	height: 100%;
	display: flex;
	flex-direction: column;
}

main {
	flex: 1;
	overflow: auto;
	height: 100%;
	overflow: auto;
	visibility: hidden;
	text-align: center;
}

header {
	text-align: center;
	font-size: 24px;
	font-weight: bold;
	padding: 20px;
	background: #007BFF;
	color: whitesmoke;
	margin-bottom: 20px;
}

footer {
	font-size: 14px;
	color: #777;
	margin-top: 20px;
	padding: 10px;
	border-top: 1px solid #ccc;
	text-align: center;
}