All routing logic in app.py are working correctly.

frontend/templates/index.html

@@ -11,4 +11,7 @@
     <p class="important">
       Welkom bij Groclist
     </p>
+    <form method="post" action="/">
+        <input type="submit" value="Inloggen" name="login"/>
+    </form>
 {% endblock %}