<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#topNavbar" aria-controls="topNavbar" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <a class="navbar-brand" href="/"><img src="/img/header-logo.png" alt="Prolicht"/></a>
    <div id="topNavbar" class="navbar-collapse collapse">
        <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
        </ul>
    </div><!--/.navbar-collapse -->
</nav>