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class _home extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return _homeState();
}
}
class _homeState extends State<_home> {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new Scaffold(
appBar: new AppBar(
title: Text("title"),
centerTitle: true,
),
body: new Center(
child: new Container(
height: 200.0,
decoration: new BoxDecoration(
gradient: const LinearGradient(
colors: [Colors.amberAccent, Colors.lightBlue, Colors.red]),
border: Border.all(width: 5.0,color: Colors.green)

),
),
)
);
}

效果图