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CSS Flexbox Playground

Experiment with Flexbox properties visually and copy the CSS.

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.container {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: stretch;
  flex-wrap: nowrap;
  gap: 8px;
}

CSS Flexbox Playground — Learn Flexbox Visually and Ship Layouts Faster

CSS Flexbox is the most powerful layout tool in every front-end developer's toolkit, yet many developers still look up property names and value combinations every time they write a layout. This interactive playground lets you experiment with every Flexbox property in real time — see exactly what each combination produces before you write a single line of production code.

How to use this playground

Adjust any container property — flex-direction, justify-content, align-items, flex-wrap, align-content, or gap — using the controls on the left. The live preview panel on the right updates instantly, showing coloured flex items responding to your property changes. When you have the layout you want, click Copy CSS to get the exact declarations ready to paste into your stylesheet. You can also adjust individual item properties like flex-grow, flex-shrink, flex-basis, order, and align-self on each child independently.

Why visual Flexbox tools matter

Reading the MDN documentation for justify-content tells you what each value means. Seeing space-around versus space-evenly update live in a preview with five items tells you which one to pick for your specific layout. Developers who learn Flexbox visually internalize the mental model faster and stop second-guessing themselves when building navbars, card grids, and centered hero sections. This playground is designed for that exact learning loop — try, observe, understand, repeat.

Who uses this tool

Junior developers use it while learning Flexbox for the first time — the instant feedback loop replaces hours of trial-and-error in a code editor. Experienced developers use it as a quick scratchpad when they hit an edge case (like a sticky footer or a sidebar layout that needs to fill remaining height). Design-to-code workflows use it to quickly prototype a specific component layout before committing it to a component library.

Privacy and data handling

This playground runs entirely in your browser — no CSS code, no layout configurations, and no session data is sent to any server. You can use it on proprietary internal projects or behind a firewall without any data leaving your device.

Frequently asked questions

What is CSS Flexbox?
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout method for arranging items in rows or columns. It makes it easy to distribute space and align items in a container, even when their sizes are unknown or dynamic.
What is the difference between justify-content and align-items?
justify-content controls alignment along the main axis (row = horizontal, column = vertical). align-items controls alignment along the cross axis (perpendicular to the main axis). Together they position items both horizontally and vertically.
When should I use flex-wrap: wrap?
Use flex-wrap: wrap when you want items to wrap onto a new line when they don't fit in one row. Without wrapping, items either shrink to fit or overflow the container.
What does align-content do?
align-content distributes space between rows of a multi-line flex container (only applies when flex-wrap is wrap or wrap-reverse and there are multiple lines). It h effect on single-line containers.
How do I centre an element with Flexbox?
Set display: flex on the parent, then use justify-content: center and align-items: center. This centres the child element both horizontally and vertically inside the parent.

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