#backToTopID {
    visibility:hidden;
    top:calc(100% / 2);
    top:-moz-calc(100% / 2);
    top:-o-calc(100% / 2);
}

.back-to-top-section {
	position: relative;
	width: 100%;
	height: 140px;
	background-color: #fff
}
.back-to-top-image {
	transition-property: all;
	transition-duration: .3s;
	transition-timing-function: ease;
	transition-delay: 0s;
	position: fixed;
	right: 18px;
	bottom: 20px;
	z-index: 98;
	display: flex;
	justify-content: center;
	align-items: center;
	width: 56px;
	height: 56px;
	border: 1px solid #5b7079;
	border-radius: 16px;
	box-sizing: border-box;
	color: #fff;
	background-color: #5b7079;
	transform: translateZ(0);
	cursor: pointer
}

.back-to-top-image:hover {
	border: 1px solid #a3cd39;
}

.back-to-top-image-hidden {
	opacity: 0;
	visibility: hidden
}

.back-to-top-image-with-one {
	bottom: 92px
}

.back-to-top-image-with-two {
	bottom: 166px
}