-content-center" id="collapsingNavbar">
            <ul class="navbar-nav ml-auto">
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="layoutDd" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                      Layouts
                    </a>
                    <div class="dropdown-menu" aria-labelledby="layoutDd">
                        <a class="dropdown-item px-2" href="./">Default</a>
                        <a cl