body {
	background: url(../img/fondo.png);
	background-size: cover;
}

.contenedor {
	font-family: verdana, arial;
	width: 65%;
	margin: 0 auto;
	margin-top: 30px;
	border: 5px solid black;
	border-radius: 20px;
	padding: 10px;
	background-color: #e2d6a4;
}

#cabecera {
	text-align: center;
	color: blue;
	border: 2px solid grey;
	border-radius: 24px;
	box-shadow: -5px -5px grey;
}

#prin {
	padding: 4em;
	text-align: justify;
}

.ejem pre {
	background-color: white;
	width: 50%;
	padding: 10px;
}