.whatsapp-button {
  display: inline-block;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #25D366;
  box-shadow: 2px 2px 3px rgba(0,0,0,0.2);
  z-index: 100;
  overflow: hidden;
  transition: all 0.3s ease-in-out;
}

.whatsapp-button img {
  width: 100%;
  height: auto;
  opacity: 0.8;
  transition: all 0.3s ease-in-out;
}

.whatsapp-button:hover {
  background-color: #128C7E;
  transform: scale(1.1);
}

.whatsapp-button:hover img {
  opacity: 1;
}