Web/main/_includes/nav/navbar.html

<nav class="navbar fixed-top navbar-expand-lg navbar-light bg-light rounded-bottom" id="navbar">
    <script>
        if (dark) {
            let navbar = $("#navbar");
            navbar.removeClass("navbar-light bg-light");
            navbar.addClass("navbar-dark bg-dark");
        }
    </script>

    <!-- Navbar brand and logo -->
    <a class="navbar-brand mb-0 h1" href="#">
        <img src="/res/logo.png" width="40" height="40" alt="A pixelart version of Ellpeck"> Ellpeck.de
    </a>

    <!-- Responsive navbar menu opener -->
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-content" aria-label="Navbar toggler">
        <span class="navbar-toggler-icon"></span>
    </button>

    <!-- Navbar content -->
    <div class="collapse navbar-collapse" id="navbar-content">
        <div class="navbar-nav mr-auto" id="nav-items">
            {% if page.nav %}
            {% include {{page.nav}} %}
            {% elsif layout.nav %}
            {% include {{layout.nav}} %}
            {% endif %}
        </div>
        <span class="navbar-text">
            <div class="custom-control custom-checkbox">
                <input type="checkbox" class="custom-control-input" id="dark-mode">
                <label class="custom-control-label" for="dark-mode">🌙 Dark Mode</label>
            </div>
        </span>
    </div>
</nav>