CSS Flexbox Generator
Build Flexbox layouts visually — set direction, justify, align, wrap and gap — with a live preview and copy-ready CSS.
About the CSS Flexbox Generator
This Flexbox generator lets you design a flex container with dropdowns and sliders instead of memorising properties. Adjust flex-direction, justify-content, align-items, flex-wrap and the gap, add or remove items, and watch a live preview rearrange instantly — then copy the exact CSS.
Flexbox is the modern way to lay out rows and columns in one dimension: navigation bars, card rows, centred hero content and responsive toolbars. Seeing justify-content and align-items react in real time is the fastest way to build an intuition for the main axis versus the cross axis.
The generated CSS is clean and standard, working in every modern browser with no prefixes. Everything runs in your browser, so it doubles as a learning sandbox you can experiment in freely.
How to Use the CSS Flexbox Generator
- 1Pick the flex-direction and whether items wrap.
- 2Choose justify-content (main axis) and align-items (cross axis).
- 3Set the gap and add or remove preview items.
- 4Copy the generated container CSS into your stylesheet.
Frequently Asked Questions
What is the difference between justify-content and align-items?
justify-content distributes items along the main axis — horizontally in the default row direction — with values like flex-start, center, space-between and space-around. align-items positions items along the cross axis (vertically for a row) with values like stretch, center and flex-end. Switching flex-direction to column swaps which axis each controls.
How do I center a div with Flexbox?
Set the container to display:flex, then justify-content:center and align-items:center. That centres a child both horizontally and vertically. It's the cleanest solution to the classic 'center a div' problem — pick center for both axes in this generator and copy the CSS.
What does flex-wrap do?
By default flex items stay on one line and shrink to fit (nowrap). Setting flex-wrap:wrap lets items flow onto multiple lines when they run out of room, which is essential for responsive card grids and tag lists. This tool toggles wrap so you can see items reflow live.
When should I use Flexbox versus CSS Grid?
Flexbox excels at one-dimensional layouts — a single row or column where items size themselves to their content, like navbars and button groups. CSS Grid is designed for two-dimensional layouts with explicit rows and columns. Many pages use Grid for the overall structure and Flexbox for the components inside it.
Does the generated CSS need vendor prefixes?
No. Flexbox has been unprefixed in every major browser for many years, so the standard display:flex and its properties work everywhere in use today. The generator outputs clean, prefix-free CSS.