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#contenido {
	width: 100vw; /* % del viewport */
	height: 80vw; /* alto/ancho * % del viewport, 4/5*100 */
	max-height: 100vh;
	max-width: 125vh; /* ancho/alto * % del viewport, 5/4*100 */
	margin: auto;
	position: absolute;
	top:0;
	bottom:0;
	left:0;
	right:0;
}