CSS Flexbox Playground
Build and preview flex direction, wrapping, item sizing, alignment and gaps, then export the generated CSS.
Loading tool…
How to use CSS Flexbox Playground
Use an actual browser flex container to understand how its main axis, cross axis, wrapping and free-space distribution interact. Numbered items preserve their document order even when the visual direction is reversed.
- Choose the bounded settings and select Run tool.
- Inspect the native preview and generated CSS. Smaller screens can scroll inside a fixed-size layout preview.
- Copy or download the CSS, then adapt selectors and test real content in your own project.
Good to know
- The preview uses fixed-size English numbered items, horizontal writing and left-to-right text. Real content and writing modes can change layout.
- A fixed preview width and minimum height are exported. Adjust these for your responsive design; reverse direction changes visual order, not keyboard or screen-reader order.
- No HTML or CSS input is executed. Only known properties, enumerated choices and bounded numbers reach this preview. No data leaves this tab.
Common questions
Is the generated CSS ready for every production page?
It is a starting point. Test overflow, realistic content, visual and document order, keyboard use and responsive sizing in context.
Does the preview upload information or import a framework?
No. It uses native browser rendering with original local demonstration content. It makes no external requests, saves no history and requires no framework.
Keep going with related tools
All developer →CSS Grid Layout Builder
Generate fixed columns or auto-fitting CSS card grids with native layout, spacing and row-size previews.
DeveloperCSS Formatter and Minifier
Format a CSS stylesheet or serialize its syntax tree with compact token spacing.
DeveloperResponsive Media Query Builder
Build width, orientation, pointer and preference queries and observe whether the native browser matches them.