.whatsapp {
   position: fixed;
   left: 1rem;
   bottom: 1rem;
   border-radius: 1.5rem;
   width: 3rem;
   height: 3rem;
   text-align: center;
   color: #fff;
   background: #25D366;
   line-height: 60px;
}
.whatsapp:hover {
   color: white;
   background: #50e086;
}