перешёл на новую версию флаттера и слетел цвет шапки

lib/main.dart

@@ -12,7 +12,7 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: 'Flutter Demo',
       theme: ThemeData(
-        primarySwatch: Colors.blue,
+        primarySwatch: Colors.amber,
       ),
       home: const MyHomePage(title: 'Flutter Demo Home Page'),
     );
@@ -40,28 +40,106 @@ class _MyHomePageState extends State<MyHomePage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
+        appBar: AppBar(
-        title: Text("Кувшинов Тимур Александрович"),
+          title: Text("Кувшинов Тимур Александрович"),
+          backgroundColor: Colors.amber,
+        ),
+        backgroundColor: Colors.yellow,
+        body: const MyWidget());
+  }
+}
+
+class MyWidget extends StatelessWidget {
+  const MyWidget({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final List<_CardData> data = [
+      _CardData('orange', imageUrl: 'https://kuban24.tv/wp-content/uploads/2023/10/photo_2023-10-02_16-08-02.jpg'),
+      _CardData("aboba", imageUrl: 'https://masterpiecer-images.s3.yandex.net/5fa453a2d4c51a7:upscaled'),
+      _CardData("Hello world!!!", imageUrl: 'https://m.media-amazon.com/images/I/81YqUbAZ0GL._AC_UF1000,1000_QL80_.jpg'),
+      _CardData('(=^･^=)',
+          imageUrl:
+              'https://i.pinimg.com/236x/c8/cc/24/c8cc24bba37a25c009647b8875aae0e3.jpg'),
+      _CardData('плохо быть старым ' + 'трезвым и больным, ' * 5,
+        imageUrl: 'https://images.genius.com/c754c6f1755acee741881d55985a6c34.865x865x1.jpg'
       ),
-      body: Center(
+    ];
+
+    return Center(
+      child: SingleChildScrollView(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
+          children: data.map((e) => _Card.fromData(e)).toList(),
-            const Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headlineLarge,
-            ),
-          ],
         ),
       ),
-      floatingActionButton: FloatingActionButton(
+    );
-        onPressed: _incrementCounter,
+  }
-        tooltip: 'Increment',
+}
-        child: const Icon(Icons.add),
+
-      ),
+class _CardData {
+  final String text;
+  final String? imageUrl;
+
+  _CardData(
+    this.text, {
+    this.imageUrl,
+  });
+}
+
+class _Card extends StatelessWidget {
+  final String _text;
+  final String? imageUrl;
+
+  const _Card(this._text, {Key? key, this.imageUrl}) : super(key: key);
+
+  factory _Card.fromData(_CardData data) => _Card(
+        data.text,
+        imageUrl: data.imageUrl,
+      );
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.all(10),
+      margin: const EdgeInsets.all(10),
+      decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular(20),
+          color: Colors.amber,
+          border: Border.all(color: Colors.amberAccent, width: 2),
+          boxShadow: [BoxShadow(
+            color: Colors.grey.withOpacity(.5),
+            blurRadius: 8,
+            offset: const Offset(0, 5),
+            spreadRadius: 4,
+          )]
+      ),
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          ClipRRect(
+            borderRadius: const BorderRadius.horizontal(left: Radius.circular(150), right: Radius.circular(30)),
+            child: SizedBox(
+              height: 160,
+              width: 90,
+              child: Image.network(
+                imageUrl ?? '',
+                fit: BoxFit.cover,
+                errorBuilder: (_, __, ___) => const Placeholder(),
+              ),
+            ),
+          ),
+          Expanded(
+            child: Padding(
+              padding: const EdgeInsets.all(8.0),
+              child: Text(
+                _text,
+                style: Theme.of(context).textTheme.headlineLarge,
+              ),
+            ),
+          ),
+        ],
+      ),
     );
   }
 }