html {
	scroll-behavior: smooth;
}
.back-to-top-button {
	position: fixed;
	bottom: 20px;
	right: 20px;
	opacity: 0;
	transition: opacity 0.5s ease-in-out;
	width: 50px;
	height: 50px;
	z-index: 500;
	background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(0, 0, 0, 0.1);
	cursor: pointer;
}
.back-to-top-button:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: opacity 0.2 linear;
}