#myBtn {
  display: none;
  position: fixed;
  bottom: 10px;
  right: 15px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: transparent;
  color: deeppink;
  cursor: pointer;
  padding: 0 3px 0 3px;
  border-radius: 6px;
}

#myBtn:hover {
  background-color: darkslateblue;
}