*{
    box-sizing:border-box;
}

html,
body{
    width:100%;
    overflow-x:hidden;
}

.mobile-whatsapp{
    position:fixed;
    left:15px;
    bottom:20px;
    width:60px;
    height:60px;
    background:#25D366;
    color:#fff;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    text-decoration:none;
    font-size:32px;
    z-index:999999;
    box-shadow:0 4px 15px rgba(0,0,0,.25);
    animation:whatsappPulse 2s infinite;
}

@keyframes whatsappPulse{
    0%{
        box-shadow:0 0 0 0 rgba(37,211,102,.7);
    }
    70%{
        box-shadow:0 0 0 15px rgba(37,211,102,0);
    }
    100%{
        box-shadow:0 0 0 0 rgba(37,211,102,0);
    }
}