body{margin:0;font-family:Arial,sans-serif}.whatsapp{position:fixed;bottom:20px;right:20px;width:60px;height:60px;background:#25d366;color:#fff;display:flex;align-items:center;justify-content:center;border-radius:50%;font-size:28px;text-decoration:none;box-shadow:0 4px 10px #0000004d}