navbar.html.twig

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <a href="{{ path('app_homepage') }}" class="navbar-brand">
        <i class="material-icons">home</i>
    </a>

    <button
        class="navbar-toggler"
        type="button"
        data-toggle="collapse"
        data-target="#navbarSupportedContent"
        aria-controls="navbarSupportedContent"
    >
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <div class="navbar-nav mr-auto">
            <a href="#" class="nav-item nav-link">A nav link</a>
        </div>
        <div class="navbar-nav ml-auto">
            <a href="{{ path('app_logout') }}" class="nav-item nav-link">{{ 'Logout'|trans }}</a>
        </div>
    </div>
</nav>