Build Flexbox layouts interactively
Flexbox controls how items share space along a row or column, but properties like justify-content and align-items are easier to understand by seeing than by reading. This interactive builder lets you toggle each property and watch the boxes rearrange instantly, then copy the CSS — a fast way to get a layout right and to finally internalise what each setting does.
How to use it
- Adjust direction, justification, alignment, and wrapping.
- Watch the items respond in real time.
- Copy the generated CSS into your project.
Key properties
justify-contentspaces items along the main axis.align-itemspositions them across the cross axis.flex-wrapdecides whether items spill onto a new line.
Questions people ask
Why don't my items align the way I expect? Alignment depends on the flex direction — swapping row for column swaps which axis each property controls.
Is anything uploaded? No — everything runs in your browser.