Separacion de codigo por carpetas, cambio de estilo, clase pregon integrada

lib/bars/app_bar

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+
+class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
+  const CustomAppBar({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return AppBar(
+      title: const Text(''),
+      centerTitle: true,
+      backgroundColor: Color.fromARGB(255, 78, 169, 6),
+      flexibleSpace: Container(
+        padding: const EdgeInsets.all(8.0),
+        child: Center(
+          child: Padding(
+            padding: const EdgeInsets.only(top: 30.0),
+            child: Image.asset(
+              'assets/logo-civan.png',
+              height: 150,
+              width: 150,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  @override
+  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
+}