#page-up{
  display: block;
  position: fixed;
  z-index: 9999;
  bottom: -80px;
  right: 20px;
  width: 35px; height: 34px;
  padding: 0px 0px;
border-radius: 3px;  
  color: rgba(76, 72, 72, 0.60);
  text-align: center;
  text-decoration: none;
  transition: .5s;
  border: solid 3px ;
border-color: rgba(0, 0, 0, 0.0);
}