#toTop {
	background-color: #FFF;
	border-radius: 4px;
	bottom: 53px;
	box-shadow: 0 0 3px #333;
	display: block;
	height: 42px;
	left: 20px;
	opacity: 0.7;
	position: fixed;
	transition:opacity .3s linear, transform .3s linear;
	width: 42px;
	z-index: 10;
}
#toTop::after {
	border: 3px solid #444;
	border-right-width: 0;
	border-bottom-width: 0;
	content: '';
	height: 10px;
	left: 50%;
	position: absolute;
	top: 17px;
	transform: translateX(-50%) rotate(45deg);
	width: 10px;
}
#toTop:not(.active){opacity:0; transform:scale(0)}
#toTop:focus,
#toTop:hover,
#toTop:active{opacity:1}