Font Awesome Whatsapp: Fab Fa Whatsapp, Fa Brands Fa Whatsapp

<!DOCTYPE html>
<html>

<body>
 <div class="container">
 <h1>Fa Brands Fa Whatsapp icon | HTML CSS </h1>
 Click the button to chat on WhatsApp:
 <a href="#" class="whatsapp-button"> Whatsapp</a>
 Default Size: 
 Size 2xs: 
 Size xs : 
 Size sm :
 Size lg : 
 Size xl : 
 Size xl : 
 </div>
 <style>
 .whatsapp-button {
 display: inline-block;
 padding: 10px 20px;
 color: #ffffff;
 text-decoration: none;
 border-radius: 5px;
 transition: background-color 0.3s ease;
 background-color: #25D366;
 color: #fff;
 padding: 10px;
 text-decoration: none;
 transition: background-color 0.3s ease-in-out;
 }

.whatsapp-button:hover {
            background-color: #128C7E;

}

.container {
 margin: 0 auto;
 width: 600px;
 padding: 20px;
 box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
 }
 </style>
</body>

</html>