#myBtn {
  display: none;
  position: fixed;
  bottom: 0px;
  left: 48%;
  z-index: 99;
  border: none;
  outline: none;
  background-color:  rgba(173, 22, 114,0.5);
  color: white;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
}
#myBtn:hover {
  background-color:  rgba(173, 22, 114,0.9);
}