#back2top {
	display: block;
	padding: .5rem;
	width: 60px;
	height: 60px;
	border-radius: 50%;
	background-color: #000;
	
	position: fixed;
	bottom: 1.5rem;
	right: 1.5rem;
	
	opacity: 0;
	transition: .4s ease-in-out;
}
#back2top img {
	width: 100%;
	height: auto;
}
#back2top:hover,
#back2top.focus-visible {
	transform: scale(1.1);
}

.back2top-btn #back2top {
	opacity: 1;
}