#backtotop {
	background: url(../backtotop.png) no-repeat center center;
	bottom: 20px;
	cursor: pointer;
	display: none;
	height: 40px;
	position: fixed;
	right: 20px;
	text-indent: -9999px;
	width: 40px;
	z-index: 1;
	border-radius: 5px;
	opacity: 0.6;
}

#backtotop:hover {
  opacity: 0.8;
}

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  #backtotop {
    background: url(../backtotop2x.png) no-repeat center center;
    background-size: 70px 70px;
  }
}

@media print {
  #backtotop {
    visibility: hidden;
  }
}