CSS Flexbox Generator
Pick your flex-direction, alignment and gap settings, watch a live preview of numbered child boxes rearrange instantly, and copy the finished container CSS straight into your project.
How to Use the CSS Flexbox Generator
- Choose a flex-direction to set whether children flow in a row or a column.
- Set justify-content and align-items to control spacing along the main and cross axes.
- Adjust flex-wrap and the gap between items, and set how many numbered child boxes to preview (2-6).
- Copy the generated container CSS and apply it to your flex container's class in your stylesheet.
Why Use This Tool?
Is my layout data uploaded anywhere?
No. Every setting you choose is applied directly to a live preview using CSS in your own browser — nothing is sent to a server, logged, or stored. This tool is simply a faster way to see flexbox properties in action than writing and reloading CSS by hand.
Why is flexbox still relevant when CSS Grid exists?
Flexbox and Grid solve different problems. Flexbox excels at one-dimensional layouts — arranging items in a single row or column with flexible spacing, like a navigation bar, a button group, or a card's internal content. Grid is better for two-dimensional layouts with both rows and columns. Most real interfaces use both: Grid for overall page structure, and Flexbox for the components inside it.
What's the difference between justify-content and align-items?
justify-content controls spacing along the main axis (the direction set by flex-direction — horizontal for "row", vertical for "column"). align-items controls alignment along the cross axis (perpendicular to the main axis). Toggling flex-direction between "row" and "column" effectively swaps which axis each property affects, which is a common point of confusion this live preview helps clarify visually.
Does this CSS need vendor prefixes?
No. Modern flexbox properties (display: flex, flex-direction, justify-content, align-items, flex-wrap and gap) are supported without prefixes in all current versions of Chrome, Firefox, Safari and Edge. The gap property specifically has been supported in flex containers across all major browsers since 2021, so it's safe to use in current production projects.