decoration: new BoxDecoration(color: Color(0xffF5F5F5)),

以上代码,给当前页,某个盒子设置背景颜色都可以

这个是当前页的背景颜色

Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text('提交订单'),
        ),
        body: Container(
          decoration: new BoxDecoration(color: Color(0xffF5F5F5)),
          child: Column(
            children: <Widget>[],
          ),
        ));
  }

 这个某个盒子设置颜色

class NoteIntegral extends StatelessWidget {
  const NoteIntegral({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: new BoxDecoration(color:Color(0xffFFFFFF)),
      child: child,
    );
  }
}