A widget that positions its children relative to the edges of its box.
Example
Stack(
children: <Widget>[
Container(
width: 100,
height: 100,
color: Colors.red,
),
Container(
width: 90,
height: 90,
color: Colors.green,
),
Container(
width: 80,
height: 80,
color: Colors.blue,
),
],
)
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