Learn how to set a full-screen background image in CSS using background-size: cover, media queries, and ready-to-copy examples. A practical, fast, and optimized guide.

We will introduce MediaQuery in Flutter as a fundamental element when we want to create an adaptive or responsive design for Flutter, learning how we can obtain the screen size as well as the orientation and the MediaQuery widgets: Flex, Orientation, Expanded and Size.

The FractionallySizedBox widget allows you to align elements so that they occupy a percentage of the parent element and is an option to MediaQueries.