.whatsapp-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #25D366;
  color: white;
  padding: 12px 18px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: bold;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
  z-index: 1000;
}
.whatsapp-btn:hover {
  background-color: #1ebe5d;
}