.cd-top {
	display: inline-block;
	height: 40px;
	width: 40px;
	position: fixed;
	z-index: 1;
	bottom: 40px;
	right: 10px;
	-webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
	overflow: hidden;
	text-indent: 100%;
	white-space: nowrap;
	background: rgba(100, 100, 100, 0.4) url(../img/backtoTop.svg) no-repeat center 50%;
	backdrop-filter: blur(10px);
	visibility: hidden;
	opacity: 0;
	-webkit-transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
	transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
}

.cd-top.cd-top--show,
.cd-top.cd-top--fade-out,
.cd-top:hover {
	-webkit-transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
	transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
}

.cd-top.cd-top--show {
    /* the button becomes visible */
	visibility: visible;
	opacity: 1;
}

.cd-top.cd-top--fade-out {
    /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
	opacity: .5;
}

.cd-top:hover {
	background-color: rgba(100, 100, 100, 0.8);
	border-radius: 10px;
	opacity: 1;
}

@media only screen and (min-width: 768px) {
	.cd-top {
		right: 20px;
		bottom: 20px;
	}
}

@media only screen and (min-width: 1024px) {
	.cd-top {
		height: 60px;
		width: 60px;
		right: 30px;
		bottom: 30px;
	}
}