/* -- Header -- */
*{
	margin: 0;
	padding: 0;
}

body{
	background: #fffffa;
}

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

.contenido p{
	margin-bottom: 1em;
}

.ir-arriba {
	display: inline-block;
	padding: 20px;
	background: #024959;
	font-size: 20px;
	color: #fff;
	cursor: pointer;
	position: fixed;
	bottom: 20px;
	right: 0px;
}

.back-to-top{
	position: fixed;
	right: 1rem;
	bottom: 1rem;
	display: block;
	background: tomato;
	color: white;
	padding: 0.3rem 1rem;
	transition: all 0.5s linear;
	cursor: pointer;
	opacity: 0.3;
}

.back-to-top:hover {
	opacity: 1;
}