add overflow-hidden to iframe navbar

iframe.html

@@ -761,7 +761,7 @@
         </div>
       </div>
       <a class="nav-link bg-light" href="#" data-widget="iframe-scrollleft"><i class="fas fa-angle-double-left"></i></a>
-      <ul class="navbar-nav" role="tablist"></ul>
+      <ul class="navbar-nav overflow-hidden" role="tablist"></ul>
       <a class="nav-link bg-light" href="#" data-widget="iframe-scrollright"><i class="fas fa-angle-double-right"></i></a>
       <a class="nav-link bg-light" href="#" data-widget="iframe-fullscreen"><i class="fas fa-expand"></i></a>
     </div>