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lib/07/01/pages/page_a.dart

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+import 'package:flutter/material.dart';
+import 'package:iroute/07/01/pages/page_b.dart';
+
+class PageA extends StatelessWidget {
+  const PageA({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCFFFF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: Text('A'),
+      elevation: 0,
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageB(context),
+          child: Text('Push B'),
+        ),
+      ),
+    );
+  }
+
+  void toPageB(BuildContext context){
+    Navigator.of(context).push(MaterialPageRoute(builder: (_)=> const PageB()));
+  }
+}

lib/07/01/pages/page_b.dart

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+import 'package:flutter/material.dart';
+
+import 'page_c.dart';
+
+class PageB extends StatelessWidget {
+  const PageB({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCE5FF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: Text('B',style: TextStyle(color: Colors.black),),
+        elevation: 0,
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageC(context),
+          child: Text('Push C'),
+        ),
+      ),
+    );
+  }
+
+  void toPageC(BuildContext context){
+    Navigator.of(context).push(MaterialPageRoute(builder: (_)=> const PageC()));
+  }
+}

lib/07/01/pages/page_c.dart

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+import 'package:flutter/material.dart';
+
+class PageC extends StatelessWidget {
+  const PageC({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text('C'),),
+      body: Center(
+        child: Text(
+          'C'
+        ),
+      ),
+    );
+  }
+}