An example of container widget in Flutter

container.dart

Container(
  color: Colors.red,
  padding: const EdgeInsets.all(8.0), /* Padding applies within the bounds of the container */
  margin: const EdgeInsets.all(8.0), /* Padding applies outside the bounds of the container */
  height: 300,
  width: 300,
  child: Text('Hello World!'),
),