// Modify the following lines in main.dart.

Widget build(BuildContext context) {
  return new Scaffold(
    appBar: new AppBar(
        title: new Text("Friendlychat"),
        elevation:
            Theme.of(context).platform == TargetPlatform.iOS ? 0.0 : 4.0),
    body: new Container(                                             //modified
        child: new Column(                                           //modified
          children: <Widget>[
            new Flexible(
              child: new ListView.builder(
                padding: new EdgeInsets.all(8.0),
                reverse: true,
                itemBuilder: (_, int index) => _messages[index],
                itemCount: _messages.length,
              ),
            ),
            new Divider(height: 1.0),
            new Container(
              decoration: new BoxDecoration(color: Theme.of(context).cardColor),
              child: _buildTextComposer(),
            ),
          ],
        ),
        decoration: Theme.of(context).platform == TargetPlatform.iOS //new
            ? new BoxDecoration(                                     //new
                border: new Border(                                  //new
                  top: new BorderSide(color: Colors.grey[200]),      //new
                ),                                                   //new
              )                                                      //new
            : null),                                                 //modified
  );
}