.mg-scrollTop{ 
    background: url(totop.png) 50% 50% no-repeat #3E78E9;
    display:block; width:50px; height:50px; 
    position:fixed; bottom:50px; right:5px;
    z-index:1000; 
	border-radius:50%;
	transition: all 300ms ease-in-out 0s
}
.mg-scrollTop:hover{background: url(totop.png) 50% 50% no-repeat #FF6A00; position:fixed; bottom:15px; right:5px; }