CSS Flexbox Generator
Build a flex container visually: choose the direction, wrapping, justification, alignment and gap, watch a live preview update instantly, and copy the generated CSS. Everything runs in your browser — your settings are never sent anywhere and nothing is stored.
How to use the flexbox generator
- Set flex-direction to lay items out in a row or a column.
- Use justify-content to space items along the main axis and align-items to align them on the cross axis.
- Turn on flex-wrap and add more items to see align-content arrange the wrapped lines.
- Adjust the gap, then copy the generated CSS into your stylesheet.
The generated rule targets your container with display:flex plus the chosen properties. Apply it to a
parent element and its direct children become the flex items automatically.
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Frequently asked questions
What is CSS Flexbox?
Flexbox (the CSS Flexible Box Layout) is a one-dimensional layout model for arranging items in a row or a column. You set display:flex on a container and then control how its children are placed, spaced and aligned with properties like justify-content and align-items.
What is the difference between justify-content and align-items?
justify-content aligns items along the main axis (the direction set by flex-direction), while align-items aligns them along the cross axis (perpendicular to the main axis). In a row layout, justify-content is horizontal and align-items is vertical.
When does align-content have any effect?
align-content only does something when items wrap onto multiple lines — so you need flex-wrap:wrap (or wrap-reverse) and enough items to fill more than one line. With a single line it is ignored.
What does the gap property do?
The gap property adds consistent spacing between flex items without adding margins on the outer edges. It is the simplest, most reliable way to space items in a modern flex layout.
Is my data sent anywhere?
No. The generator runs entirely in your browser — nothing is uploaded to a server and nothing is stored. The live preview and the generated CSS are produced locally as you change the controls.
How do I use the generated CSS?
Copy the CSS and apply it to your container element (the parent), then make its direct children the flex items. The generated rule already includes display:flex, so you only need to add your own sizing and content to the items.