padding to container flutter code example

Example 1: flutter container margin

@override
Widget build(BuildContext context) {
  return Scaffold(
    backgroundColor: Colors.white,
    body: Container(
      margin: const EdgeInsets.only(left: 20.0, right: 20.0),
      child: Container(),
    ),
  );
}

Example 2: flutter padding

const Card(
  child: Padding(
    padding: EdgeInsets.all(16.0),
    child: Text('Hello World!'),
  ),
)