Phone in mobile

<div class="footer-phone">
    <a href="tel:0981833222">Tư vấn: 0981.833.222</a>
</div>

<style type="text/css">
    .footer-phone a{
        display: none;
    }
    @media (max-width: 768px) {
        .footer-phone a {
            display: block;
            position: absolute;
            left: 10px;
            bottom: 10px;
            background: #0C8BC5;
            color: #fff;
            font-size: 16px;
            font-weight: bold;
            letter-spacing: 1px;
            height: 35px;
            line-height: 35px;
            padding: 0 15px;
            border-radius: 20px;
        }
    }
</style>