<div class=“navbar sticky-top navbar-expand-lg”>

<div class="container">
    <a class="navbar-brand" href="/">{{ site.data.site.name }}</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse"
        data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
        <span class="fas fa-hamburger"></span> <!-- haha, hamburger menu -->
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
        <ul class="navbar-nav">
            {% for category in site.data.nav.navbar %}
                <li class="nav-item">
                    <a
                        class="nav-link {% if page.url contains category.url %}nav-active{% endif %}"
                        href="{{ category.url }}">
                        {{ category.name }}</a>
                </li>
            {% endfor %}
        </ul>
    </div>
</div>

</div>