html, body{
	width:100%;
	height:100%;
	margin:0;
	padding:0;
	background-color:#f1f1f1;
}

img{
	max-width:100%;
}

#imagen{
	height:350px;
	width:350px;
	position:absolute;
	top:0px;
	bottom:0px;
	left:0px;
	right:0px;
	margin:auto;
	text-align:center;
	color:gray;
}