.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  background-color: #25d366;
  color: #fff;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  text-align: center;
  line-height: 50px;
  font-size: 24px;
  transition: background-color 0.3s;
}

.whatsapp-float:hover {
  background-color: #128c7e;
}