#whatsapp-button {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  width: 56px;
  height: 56px;
  background-color: #25D366;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

#whatsapp-button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
  filter: brightness(1.1);
}

@media (max-width: 640px) {
  #whatsapp-button {
    width: 48px;
    height: 48px;
  }
}