#topBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: red;
  background-image: url(/img/b-j-top.png); 
  background-repeat: no-repeat;
  background-position: center;
  width: 60px;
  height: 48px;
  color: white;
  cursor: pointer;
/*  padding: 15px;*/
  border-radius: 10px;
}

#topBtn:hover {
  background-color: #555;
}