CODE EXAMPLE FOR DART

flutter stack

Stack(
  children: <Widget>[
    Container(
      width: 290,
      height: 190,
      color: Colors.green,
    ),
    Container(
      width: 250,
      height: 170,
      color: Colors.red,
    ),
    Container(
      width: 220,
      height: 150,
      color: Colors.yellow,
    ),
  ],
)