#myBtn {
  display: none;
  position: fixed;
  bottom: 15px;
  right: 15px;
  z-index: 99;
  font-size: relative;
  font-weight:bold;
  border: none;
  outline: none;
  background-color: #fdcd36;
  color: #000;
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
}

#myBtn:hover {
  background-color: #e01a22;
}