#backtotop {
  background: url(../backtotop.png) no-repeat center center;
  background-size:contain;
  border: 0;
  bottom: 50px;
  cursor: pointer;
  display: none;
  height: 50px;
  position: fixed;
  right: 20px;
  text-indent: -9999px;
  width: 50px;
  z-index: 9999;
}

#backtotop:hover {
  opacity: 0.8;
}

#backtotop:focus {
  opacity: 0.6;
  outline: none;
}
#backtotop:hover::after{
    border-radius: 5px;
    white-space: nowrap;
    /* border: 1px solid red; */
    content: "Back to top";
    font-size: 12px;
    top: 30%;
    left: -25%;
    text-indent: 10px;
    position: absolute;
    width: 72px;
    height: 20px;
    color: #000;
    background-color: #FDF8E1;
    opacity: 0.7;
    visibility: visible;
	}

@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
  #backtotop {
    /*background: url(../backtotop2x.png) no-repeat center center; */
    background-size: 70px 70px;
  }
}