/* button go-up */
.go-up{
	display: none;	
}
.go-up.go-up-fixed {
	display: block;
	position: fixed;
	bottom: 30px;
	right: 15px;	
	width: 40px;
	height: 40px;
	text-decoration: none;
	border-radius: 50%;
	border: 1px solid #278AFF;
	
	background-size: 50% auto;
	background-position: center;
	background-repeat: no-repeat; 
	background-image: url(../go-up/arrow-up-gray.svg);
	
		-webkit-transition:	background .5s;
		-moz-transition:	background .5s;
		-o-transition:		background .5s;
	transition: background .5s;
			
	z-index: 99;	/* проверить, чтобы было выше всех элементов*/
}
.go-up.go-up-fixed:hover{
	
	background:  #278AFF;
	
	background-size: 50% auto;
	background-position: center;
	background-repeat: no-repeat; 
	background-image: url(../go-up/arrow-up-white.svg);
}