body {
	/*background: #FAFAFA;*/
	background-image: url('../imagenes/background-junaeb-firma-digital.jpg');
    background-size: cover;                      
    background-repeat: no-repeat;
    background-position: center center;
	background-attachment: fixed;
font-family: Arial;
font-size: 14px;
}

.div_contenedor{
	height: 100vh;
}

.div_centrado{
	background: #FFF;
	border-color: #636363;	border-width: 5px; border-style: solid;
	position: absolute;
	top:25%;
	left: 48%;           
	margin-top: -100px;
	margin-left: -100px;
	padding: 30px;
}