add structure

lib/pages/offline.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:fcs/widget/local_text.dart';
+
+
+class Offline extends StatefulWidget {
+  @override
+  _OfflineState createState() => _OfflineState();
+}
+
+class _OfflineState extends State<Offline> {
+  
+  @override
+  Widget build(BuildContext context) { 
+    final retryButton = Card(
+      elevation: 23,
+      child: Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            Icon(Icons.offline_bolt),
+            LocalText(context, "offline.status"),
+          ],
+        ),
+      ),
+    );
+
+    return Scaffold(
+      body: Center(child: retryButton),
+    );
+  }
+}