#back-to-top {
	position: fixed;
	right: 30px;
	bottom: 100px;
	width: 50px;
	height: 50px;
	border-color: transparent;
	border-radius: 50%;
	background-color: #899096;
	display: none;
}
#back-to-top:hover,
#back-to-top:focus {
	filter: brightness(1.2);
	outline: none;
}
#back-to-top::before,
#back-to-top::after {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}
#back-to-top::before {
	width: 5px;
	height: 25px;
	border-top-left-radius: 3px;
	border-top-right-radius: 3px;
	background-color: #fff;
}
#back-to-top::after {
	width: 15px;
	height: 15px;
	transform: translate(-50%, -50%) rotate(45deg);
	border-top: 5px solid #fff;
	border-left: 5px solid #fff;
}