Done login routine

lib/pages/not_found_page.dart

@@ -0,0 +1,21 @@
+import 'package:animated_background/animated_background.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/src/scheduler/ticker.dart';
+
+class NotFoundPage extends StatelessWidget {
+  const NotFoundPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBackground(
+      behaviour: RandomParticleBehaviour(),
+      vsync: Scaffold.of(context),
+      child: Center(
+        child: Text(
+          'Page not found',
+          style: Theme.of(context).textTheme.headlineMedium,
+        ),
+      ),
+    );
+  }
+}