SizedOverflowBox
A widget that is a specific size but passes its original constraints through to its child, which may then overflow.
Example
Container( color: Colors.blue[50], child: SizedOverflowBox( size: const Size(100.0, 100.0), alignment: AlignmentDirectional.bottomStart, child: Container(height: 50.0, width: 150.0, color: Colors.blue,), ), )