base.html

main.py

@@ -70,7 +70,7 @@ def list():
                 window.location="http://matekasse.server.c3h/list"
             });
         </script>
-        {% extends 'base.html' %}
+        {{ extends 'base.html' }}
         <p>1 Credit =  1,50 Euro</p>
         <form action="/list/user" method="get"> Search for User: <input name="user"><input type="submit"></form>
         <form action="/adduser" method="get"><button type="submit">Add User</button></form>