The Flexbox Generator is a visual playground for CSS flexbox. Change the container properties — flex-direction, justify-content, align-items, flex-wrap, and gap — and watch a live grid of items rearrange instantly, so you can see exactly what each property does before copying the code.
It is the fastest way to get a flex layout right without trial and error in your editor, and to learn how the properties interact. Add or remove items to test wrapping and alignment, then copy the container CSS or the equivalent Tailwind classes.
How to use the flexbox generator
- Set flex-direction to lay items in a row or column.
- Adjust justify-content (main-axis) and align-items (cross-axis) to position the items.
- Turn on flex-wrap and add items to see how they wrap, and set the gap between them.
- Copy the generated CSS for your .container, or switch to Tailwind classes.
Main axis vs cross axis
Flexbox has two axes. The main axis runs along your flex-direction (horizontal for row, vertical for column), and justify-content positions items along it. The cross axis is perpendicular, and align-items positions items along it. Switching flex-direction swaps which axis each property controls, which is the single most useful thing to understand about flexbox — the live preview makes it obvious.
Wrapping and gap
By default flex items stay on one line (nowrap) and shrink to fit. Set flex-wrap to “wrap” and they flow onto new lines when they run out of room — add a few items in the preview to see it. The gap property adds consistent spacing between items (and between wrapped rows) without needing margins.
Frequently Asked Questions
What is the difference between justify-content and align-items?
justify-content positions items along the main axis (the direction set by flex-direction), while align-items positions them along the cross axis (perpendicular to it). Changing flex-direction swaps which one is horizontal and which is vertical.
How do I center something with flexbox?
Set justify-content to center and align-items to center on the flex container. That centers the items both horizontally and vertically.
When should I use flex-wrap?
Use flex-wrap: wrap when you want items to move onto new lines instead of shrinking to fit on one line — useful for responsive card grids and tag lists.
Can I copy the layout as Tailwind classes?
Yes. Switch the output to “Tailwind” to get the equivalent flex, direction, justify, items, wrap, and gap classes.