Sizedbox flutter

SizedBox(
            width: 200.0,
            height: 200.0,
            child: Card(child: Text('Hello World!')),
          ),

Source: api.flutter.dev

Sizedbox flutter

// Creates a box with the specified size.
SizedBox.fromSize(
            size: Size.square(200.0),
            child: Card(child: Text('Hello World!')),
          ),

Source: api.flutter.dev

Sizedbox flutter

   SizedBox(
                  height: 100,
                  width: 100,
                  child: Center(
                    child: CircularProgressIndicator(),
                  ),
                )

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