flutter component position absolute
List<String> todos = [...];
return new Stack(
children: <Widget>[
new ListView(
children: todos
.map((todo) => new ListTile(title: new Text(todo)))
.toList(),
),
new Positioned(
left: 30.0,
top: 30.0,
child: new Container(
width: 100.0,
height: 80.0,
decoration: new BoxDecoration(color: Colors.red),
child: new Text('hello'),
)
),
],
);