#scrollUp {
  bottom: 20px;
  right: 20px;
  width: 30px;
  height: 30px;
  background: url("scrollUp.svg") no-repeat;
  background-size: cover;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=70);
  opacity: 0.7;
}

#scrollUp:hover {
  filter: progid:DXImageTransform.Microsoft.Alpha(enabled=false);
  opacity: 1;
}