#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  /*font-size: 18px;*/
  border: none;
  outline: none;
  /*background-color: red;*/
  /*color: white;*/
  cursor: pointer;
  /*padding: 15px;*/
  /*border-radius: 4px;*/
}

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

#myBtn {
}