html, body {
	height:100%;
	width:100%;
	margin:0;
	padding:0;
}
.box {
	position:absolute;
	top:35%;
	left:15%;
	right:15%;
	width:70%;
	height:100px;
	/*background:#f0f0f0;*/
	/*border:1px solid black;*/
	text-align:center;
}

body>.box{
	height:auto;
	min-height:100px;
}