Interactive Flexbox Playground
Experiment with CSS Flexbox layout interactively and see the properties in action.
Learning flexbox by moving things
Flexbox is the modern way to lay out rows and columns in CSS, but its properties — justify-content, align-items, flex-grow and the rest — are far easier to understand by playing than by reading. This lets you adjust the flex properties and watch the items rearrange live, so the effect of each one becomes obvious and you can find the combination that produces the layout you want.
Toggle the properties and see the layout respond instantly.
From playground to real CSS
The value is twofold: it is a genuinely effective way to learn how flexbox behaves, and it is a fast way to dial in a specific layout and then copy the CSS into your project. The two axes trip everyone up at first — how the main axis and cross axis relate, and which property controls alignment along each — and seeing it move makes that click in a way documentation rarely does. Once the layout looks right, the properties you set are the CSS you need.
Interactive Flexbox Playground FAQ
What is flexbox good for?
Laying out items in a row or column with flexible sizing and alignment — the modern default for most one-dimensional layouts.
Why use a playground to learn it?
Flexbox properties are far clearer when you see items rearrange live than when you read about them, especially the main and cross axes.
Is anything uploaded?
No. It runs entirely in your browser.