.whatsapp-btn{

    position:fixed;

    right:25px;

    bottom:25px;

    width:65px;

    height:65px;

    background:#25D366;

    color:#fff;

    border-radius:50%;

    display:flex;

    justify-content:center;

    align-items:center;

    font-size:34px;

    text-decoration:none;

    z-index:99999;

    box-shadow:0 10px 25px rgba(0,0,0,.25);

    transition:.3s;

    opacity:0;

    visibility:hidden;

}

.whatsapp-btn.show{

    opacity:1;

    visibility:visible;

}

.whatsapp-btn:hover{

    transform:scale(1.1);

}
.whatsapp-btn{

    opacity:1;

    visibility:visible;

}