html, body {
	height: 100%;
}

#contenu {
	width: 600px;
	height: 600px;
	text-align: center;
	border: 0px;
	background-color: white;
	color: green;
	position: absolute;
	left: 50%;
	top: 50%;
	margin-left: -300px;
	/* Half the width of the DIV tag which is 50 pixels */
	margin-top: -300px;
	/* Half the height of the DIV tag which is also 50 pixels */
}

.a:hover, a:visited, a:link {
	font-size: 24px;
	font-family: Arial Narrow, Arial;
	font-weight: bold;
	color: 006699;
}