/**
 * Pulsante "torna a inizio pagina".
 *
 * Foglio a sé e non partial in sass/: style.css richiede Compass per essere
 * ricompilato. Issue #67.
 */

.back-to-top {
	position: fixed;
	right: 20px;
	bottom: 20px;
	z-index: 900;
	width: 44px;
	height: 44px;
	padding: 0;
	border: 0;
	border-radius: 50%;
	background-color: #fff;
	color: #333;
	font-size: 18px;
	line-height: 44px;
	text-align: center;
	box-shadow: 0 0 15px 0 rgba(0, 0, 0, 0.15);
	opacity: 0;
	visibility: hidden;
	transition: opacity 200ms ease, visibility 200ms ease;
}

.back-to-top.is-visible {
	opacity: 1;
	visibility: visible;
}

.back-to-top:hover,
.back-to-top:focus {
	background-color: #f2f2f2;
	color: #000;
}

@media (prefers-reduced-motion: reduce) {

	.back-to-top {
		transition: none;
	}
}