diff --git a/app/views/layouts/_header.html.haml b/app/views/layouts/_header.html.haml
--- a/app/views/layouts/_header.html.haml
+++ b/app/views/layouts/_header.html.haml
@@ -2,10 +2,15 @@
   %nav
     .container-fluid
       .navbar-header
+        %button.navbar-toggle.collapsed{ data: {toggle: 'collapse', target: '#navbar-collapse'} }
+          %span.sr-only Togggle Navigation
+          %span.icon-bar
+          %span.icon-bar
+          %span.icon-bar
         %a.navbar-brand{href: main_list_path} 
           %span.glyphicon.glyphicon-home
           MAIN
-      .collapse.navbar-collapse
+      .collapse.navbar-collapse#navbar-collapse
         %ul.nav.navbar-nav
           - if (@current_user!=nil) and (GraderConfiguration.show_tasks_to?(@current_user))
             //= add_menu("#{I18n.t 'menu.tasks'}", 'tasks', 'list')