body { background: white; font-family: sans-serif; }
.btn-whatsapp {
  background-color: #25D366; /* verde WhatsApp */
  color: white;
  border: none;
  border-radius: 5px;
  padding: 10px 16px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn-whatsapp:hover {
  background-color: #1ebe5d;
}