Create rounded border button in Flutter

OutlinedButton(
  onPressed: () { print("Button is pressed"); },
  style: ButtonStyle(
    shape: MaterialStateProperty.all(
      RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(30.0),
      ),
    ),
  ),
  child: const Text("Share"),
),

We are using OutlinedButton() button widget here and using border-radius we are making its corners rounded.