Make modal drawer work

page-inserts/navbar.html

@@ -1,8 +1,8 @@
 <div class="mdc-drawer__content">
-    <nav class="mdc-list">
+    <div class="mdc-list">
         <a class="mdc-list-item" href="/luhn-algorithm/">
             <i class="material-icons mdc-list-item__graphic" aria-hidden="true">credit_card</i>
             <span class="mdc-list-item__text">Luhn Algorithm</span>
         </a>
-    </nav>
+    </div>
 </div>