#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 20px;
  border: none;
  outline: none;
  background-color: #0984e3;
  color: white;
  cursor: pointer;
  border-radius: 4px;
  width: 35px;
}
#myBtn:hover {
  background-color: #077cd5;
}