<ul class=“nav navbar-nav navbar-right”>

<li>
    <a href='https://github.com/{{ site.github_username }}' aria-label="GitHub" target='_blank' class="btn btn-lg btn-link text-white">
        <i class="fa fa-github" aria-hidden="true"></i>
    </a>
</li>
<li>
    <a href="https://twitter.com/{{ site.twitter_username }}" aria-label="Twitter" target='_blank' class="btn btn-lg btn-link text-white">
        <i class="fa fa-twitter" aria-hidden="true"></i>
    </a>
</li>

</ul>