How to overlay a view partially using the Stack widget in Flutter

Create Stack

Then inside Stack add Column and make full layout without the poster. Then as a second Child of Stack, add this combination:

new Stack(
  children: [
    new Column(
      children: _layout()
    new Positioned(
      top:200,
      left:50,
      child: _child // or optionaly wrap the child in FractionalTranslation
    )]
  )
)

Stack(
        children: <Widget>[
          Container(
            color: Colors.blue,
            height: 200.0,
          ),
          Padding(
            padding: const EdgeInsets.only(left: 20.0,right: 20.0, top:160.0),
            child: Container(
              color: Colors.pink,
              height: 150.0,
              width: 110.0,
            ),
          )
        ],
      ),

By Creating the Stack, You can add multiple Container, whichever is last added will be on the top.

Stack(
        children: <Widget>[
          Container(
            color: Colors.blue,
            height: 200.0,
          ),
          Padding(
            padding: const EdgeInsets.only(left: 20.0,right: 20.0, top:160.0),
            child: Container(
              color: Colors.pink,
              height: 150.0,
              width: 110.0,
            ),
          )
        ],
      ),