Raised buttons have a minimum size of 88.0 by 36.0 To increase/decrease the size of raised button , wrap the raised button in a container or in sized box and give them the desired height and width. For Example-> SizedBox(
width: 100, // specific value
height: 40.0, // specific value
child: RaisedButton(
onPressed: () {},
child: Text("Hello Everyone"),
),
), or Container(
width: 100,
height: 40.0,
child: RaisedButton(
onPressed: () {},
child: Text("Hello Everyone"),