.btn {
  background-color: yellow;
  border: none;
  color: black;
  padding: 12px 16px;
  font-size: 16px;
  cursor: pointer;
}

/* Darker background on mouse-over */
.btn:hover {
  background-color: white;
  color: black;
}


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

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