Flexbox (Flexible Box Module) is a CSS layout system for arranging items in a single row or column with powerful alignment and distribution controls. It's ideal for navigation bars, card layouts, and centring content.

What is the difference between justify-content and align-items?

justify-content controls alignment along the main axis (the direction of flex-direction). align-items controls alignment on the cross axis (perpendicular to flex-direction).

When should I use Flexbox vs Grid?

Use Flexbox for one-dimensional layouts (a single row or column). Use CSS Grid for two-dimensional layouts (rows and columns simultaneously). Many layouts use both — Grid for the overall layout, Flexbox for component-level arrangement.

What does flex-grow do?

flex-grow determines how much of the remaining space in a flex container a flex item should take. A value of 1 means the item grows proportionally; 0 means it doesn't grow. Items with higher flex-grow values grow more.

Is Flexbox supported in all browsers?

Yes. CSS Flexbox is supported in all modern browsers and IE11 (with some quirks). For IE10 and earlier, you'd need vendor prefixes and workarounds, but modern web development doesn't need to support these.

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Flexbox Playground

Interactive flexbox playground. Control all flex container and item properties and get the generated CSS.

flex-direction

justify-content

align-items

flex-wrap

gap: 8px

Items: 4

CSS (container)

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

What is Flexbox Playground?

The Flexbox Playground provides an interactive visual environment for exploring and generating CSS Flexbox layouts. Toggle flex properties — flex-direction, justify-content, align-items, flex-wrap, align-content, gap — and see the effect on flex items in real time.

CSS Flexbox is a powerful one-dimensional layout system for arranging items in rows or columns. Understanding how each property interacts takes practice — this playground makes that learning visual and immediate, allowing you to experiment freely before committing to code.

Why Use Flexbox Playground?

Flexbox has 12+ properties that interact in complex ways, making it challenging to learn from documentation alone. This interactive playground lets you see each property's effect instantly, accelerating understanding and enabling you to design layouts visually before writing a single line of code.

Key Features of Flexbox Playground

✓Visual toggle for all major flexbox container properties
✓Add and remove flex items dynamically
✓Adjustable item flex-grow, flex-shrink, flex-basis
✓Live CSS code output that updates with every change
✓Copy complete flex container and item CSS

How to Use Flexbox Playground

1
Set flex-direction
Choose row, row-reverse, column, or column-reverse to set the main axis.
2
Adjust justify-content
Control how items are distributed along the main axis.
3
Set align-items
Control how items are aligned on the cross axis.
4
Toggle flex-wrap
Enable wrapping to see how items flow to new rows/columns.
5
Copy the CSS
Click 'Copy CSS' to get the complete flexbox code for your layout.