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CSS Flexbox Playground

Master CSS Flexbox by experimenting with flex properties and seeing instant visual results.

Web Development v1.0.0 252 uses
Step 1 of 4

Step 1: What is Flexbox?

Flexbox is a CSS layout model that makes it easy to align and distribute space among items in a container.

To enable Flexbox, set display: flex on a container. Its children become flex items.

.container {
  display: flex;
  /* Items now flow horizontally by default */
}

Key concepts:

  • Main axis — the primary direction items flow (default: horizontal)
  • Cross axis — perpendicular to the main axis

About This Lab

Flexbox is one of the most powerful layout tools in CSS. This interactive lab lets you experiment with key flex properties — direction, alignment, wrapping, and spacing — while seeing how each change affects the layout in real time. Perfect for both beginners learning Flexbox for the first time and developers who want a quick refresher.

How It Works

  1. 1 Read the explanation for each Flexbox property
  2. 2 Use the interactive controls to change values
  3. 3 Watch the live preview update instantly
  4. 4 Complete the quiz to test your Flexbox knowledge
  5. 5 Experiment freely — you can't break anything!
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