#und_constru {
	font-family: Arial, Helvetica, sans-serif;
	width:100%;
	min-height: 100%;
	height: auto !important;
	height: 100%;
	margin:auto;
	text-align:center;
	vertical-align:middle;
}

html, body {
	height: 100%;
	margin:0px;
	padding:0px;
}