#scrollTopBtn {
	display: none;
	position: fixed;
	bottom: 30px;
	right: 30px;
	z-index: 99;
	border: 1px solid #ddd;
	background-color: #ffffff;
	width: 45px;
	height: 45px;
	border-radius: 50%;
	box-shadow: 0 2px 4px rgba(0,0,0,0.1);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: background-color .1s, box-shadow .1s;
	padding: 0;
}
#scrollTopBtn:hover {
	box-shadow: 4px 4px 10px rgba(0,0,0,0.25);
}
#scrollTopBtn svg {
	width: 20px;
	height: 20px;
	fill: #333;
	vertical-align: middle;
}