<ul class="nav justify-content-center justify-content-md-end">
    <li><a href="#" target="_blank"><em class="fab fa-facebook-f"></em></a></li>
    <li><a href="#" target="_blank"><em class="fab fa-twitter"></em></a></li>
    <li><a href="#" target="_blank"><em class="fab fa-google-plus-g"></em></a></li>
    <li><a href="#" target="_blank"><em class="fab fa-instagram"></em></a></li>
    <li><a href="#" target="_blank"><em class="fab fa-linkedin-in"></em></a></li>
</ul>