.whatsapp_float {
  position: fixed;        
  bottom: 20px;           
  right: 20px;            
  background-color: #25d366;
  color: #fff;
  border-radius: 50%;
  text-align: center;
  font-size: 28px;
  box-shadow: 2px 2px 3px rgba(0,0,0,0.3);
  z-index: 9999;
  width: 55px;
  height: 55px;
  line-height: 55px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.whatsapp_float:hover {
  transform: scale(1.1);
  box-shadow: 3px 3px 6px rgba(0,0,0,0.4);
  color: #fff;
}

.whatsapp-icon {
  vertical-align: middle;
}