CSS Flexbox Playground

Build and debug flexbox layouts visually with real-time previews, item-level controls, and export-ready CSS for faster frontend implementation.

Configure flex container behavior and per-item flex values visually, then export implementation-ready CSS and markup for responsive UI layouts.

Container Controls

flex-direction

flex-wrap

justify-content

align-items

align-content

gap (px)

padding (px)

Item Controls

Item 1

Label

flex-basis (px)

flex-grow

flex-shrink

Item 2

Label

flex-basis (px)

flex-grow

flex-shrink

Item 3

Label

flex-basis (px)

flex-grow

flex-shrink

Item 4

Label

flex-basis (px)

flex-grow

flex-shrink

Item 5

Label

flex-basis (px)

flex-grow

flex-shrink

Item 6

Label

flex-basis (px)

flex-grow

flex-shrink

Live Flex Preview

Item 1

Item 2

Item 3

Item 4

Item 5

Item 6

Generated Flexbox CSS + Markup

.flex-layout {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: stretch;
  align-content: stretch;
  gap: 12px;
  padding: 12px;
}

.flex-layout__item {
  min-height: 72px;
  border-radius: 0.75rem;
  padding: 1rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

<div className="flex-layout">
  <div className="flex-layout__item" style={{ flex: '2 1 180px' }}>
    Item 1
  </div>
  <div className="flex-layout__item" style={{ flex: '1 1 140px' }}>
    Item 2
  </div>
  <div className="flex-layout__item" style={{ flex: '1 1 140px' }}>
    Item 3
  </div>
  <div className="flex-layout__item" style={{ flex: '1 1 180px' }}>
    Item 4
  </div>
  <div className="flex-layout__item" style={{ flex: '1 1 140px' }}>
    Item 5
  </div>
  <div className="flex-layout__item" style={{ flex: '1 1 140px' }}>
    Item 6
  </div>
</div>

Flexbox Report

CSS Flexbox Playground Report
============================
Direction: row
Wrap: wrap
Justify Content: flex-start
Align Items: stretch
Align Content: stretch
Gap: 12px
Padding: 12px
Items: 6

1. Item 1 | flex: 2 1 180px
2. Item 2 | flex: 1 1 140px
3. Item 3 | flex: 1 1 140px
4. Item 4 | flex: 1 1 180px
5. Item 5 | flex: 1 1 140px
6. Item 6 | flex: 1 1 140px

Features

Full Container Control

Tune direction, wrapping, spacing, and alignment combinations to explore practical flex layout behavior for cards, toolbars, and app shells.

Per-Item Flex Controls

Adjust flex-grow, flex-shrink, and flex-basis for each item independently to prototype real distribution behavior under different viewport constraints.

Interactive Visual Preview

Observe live rendering while editing values so you can quickly identify alignment, wrapping, and spacing issues before coding final components.

Export-Ready Snippets

Copy generated CSS and markup structures directly into your project, reducing trial-and-error when implementing production flex layouts.

Use Cases

Navigation Bars

Prototype horizontal and wrapped navigation patterns with balanced spacing and alignment before integrating into header components.

Dashboard Panels

Build panel groups that expand and shrink predictably across viewport sizes by tuning item basis, grow, and shrink ratios.

Card Lists

Test wrapping card rows and vertical stacks quickly to choose the right direction and alignment behavior for content-heavy screens.

Form Layout Systems

Validate how labels, inputs, and action groups align and wrap under width constraints for consistent form ergonomics.

Design Reviews

Share concrete flex prototypes during team reviews and immediately export code snippets that match approved layout behavior.

Frontend Training

Demonstrate how flex properties interact in real time for onboarding, workshops, and debugging sessions with junior developers.

About CSS Flexbox Playground

CSS Flexbox Playground is a browser-based utility for exploring flex container and item behavior with immediate visual feedback and code export.

Why It Helps

Flexbox is powerful but often requires repeated trial-and-error across several properties. This tool keeps controls, preview, and generated code synchronized for faster layout iteration.

From Prototype to Production

After tuning values, you can copy CSS and markup snippets into your project to reduce implementation time and preserve layout intent.

Private Local Processing

Everything runs locally in-browser with no uploads or sign-in, making it reliable for quick internal experiments and team workflows.

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Frequently Asked Questions About CSS Flexbox Playground

You can configure flex-direction, flex-wrap, justify-content, align-items, align-content, gap, and padding from the control panel.

Yes. Every item supports independent flex-grow, flex-shrink, and flex-basis values so you can model realistic distribution behavior.

Yes. The tool outputs container CSS plus markup snippets and an additional report for documentation or sharing.

Yes. You can dynamically add items or remove the last one to test different content sizes and wrapping conditions.

Yes. It is free, does not require login, and runs entirely in your browser.