.contenido{
	width: 500px;
	margin: 20px auto;
	text-align: justify;
}
.contenido p{
	margin-bottom: 1em;
}

.ir-arriba {
	display:none;
	padding:20px;
	background:#1B396A;
	font-size:20px;
	color:#fff;
	cursor:pointer;
	position: fixed;
	bottom:20px;
	right:20px;
	border-radius: 30px;
}