.ir-arriba {
	padding: 7px;
	display: inline-block;
	background-color: rgba(0, 0, 0, 0.6);
	color: #fff;
	position: fixed;
	font-size: 1.6rem;
	font-style: normal;
	bottom: 10px;
	left: 10px;
	display: none;
	cursor: pointer;
	border-radius: 5px; /** 50px para que sea redondo **/
	z-index: 999999;
}