Ancho de columna de flutador
Row(
children: <Widget>[
Expanded(
flex: 2, // 20%
child: Container(color: Colors.red),
),
Expanded(
flex: 6, // 60%
child: Container(color: Colors.green),
),
Expanded(
flex: 2, // 20%
child: Container(color: Colors.blue),
)
],
)
Prickly Plover