Answers for "flutter button width"

elevated button size flutter

ElevatedButton(
    style: ElevatedButton.styleFrom(
    minimumSize: const Size(200, 50),
    maximumSize: const Size(200, 50),
    ),
onPressed: () {},
child: Text('ElevatedButton')),

how to increase button size in fltter

ButtonTheme(
  minWidth: 200.0,
  height: 100.0,
  child: RaisedButton(
    onPressed: () {},
    child: Text("test"),
  ),
);

flutter flat button size

// JZ
SizedBox(
  width: double.infinity, // <-- match_parent
  child: RaisedButton(...)
)