Hey

When i add my partialview for login it works fine. But when i do my browser window to a smartphone size. My navigation menu is gone (no menu anymore)

How can i fix this ??

i have only create the standard partialview from umbraco changed nothing in that file. and added only the partialview in my footer

<div class="row">
        <!-- Copyright -->
        <div id="copyright">
            &copy; @DateTime.Now.Year @Umbraco.Field("copyright", recursive: true) | Images: <a href="http://fotogrph.com">fotogrph</a> + <a href="http://iconify.it">Iconify.it</a> | Design: <a href="http://html5up.net/">HTML5 UP</a>

                </div>
        <!-- /Copyright -->
                  @{ Html.RenderPartial("umbLogin"); }
    </div>
</footer>
<!-- /Footer -->