.contenedor{
	background-image:url(fondos/on_error.jpg);
	background-repeat:no-repeat;
	height:400px;
	width:550px;
	margin:0px auto 0px auto;
}
.mensaje{
	margin-top:170px;
	margin-left:100px;
	margin-right:100px;
	height:150px;
	font-family:Verdana, Geneva, sans-serif;
	font-size:12px;
	color:#FFF;
	text-align:center;
}