This code defines a Flutter app with a single screen built using the ContainerExample class.

The MyApp class extends StatelessWidget and overrides its build method to return a MaterialApp widget. The MaterialApp widget is the root widget of a Flutter app that uses material design. It has several properties such as title, theme, and home.

The title property is a string that is displayed in the app bar. The theme property is a ThemeData object that defines the theme of the app. The home property is the default route of the app and is typically a widget that represents the home screen.

In this case, the home property is set to a ContainerExample widget, a custom widget displaying a container with some text.

When the app runs, the MyApp widget’s build method will be called, which will return a MaterialApp widget that displays the ContainerExample widget as the home screen.

Try removing the properties of Container in the container_example.dart file and see the change in the Container design.