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lib/07/01/main.dart

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+import 'package:flutter/material.dart';
+
+import 'pages/page_a.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        appBarTheme: AppBarTheme(
+          iconTheme: IconThemeData(color: Colors.black),
+          titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
+        )
+      ),
+      home:  const PageA(),
+    );
+  }
+}