CSS Flexbox Generator

Visual Flexbox playground with live preview. Configure container and item properties, try layout presets, and copy production-ready CSS. Everything runs in your browser.

Live Preview
flex-direction
justify-content
align-items
flex-wrap
align-content
gap
Row Gap px
Col Gap px
Container Dimensions
Height px
3 Items

Layout Presets

How to Use CSS Flexbox

CSS Flexbox (Flexible Box Layout) is a powerful one-dimensional layout system for arranging items in rows or columns. It simplifies alignment, distribution, and sizing of elements inside a container, eliminating the need for float-based hacks and complex positioning.

Container Properties

The flex container is the parent element with display: flex. It defines the flex context for its direct children. Key container properties include flex-direction (row or column), justify-content (main-axis alignment), align-items (cross-axis alignment), flex-wrap (wrapping behavior), align-content (multi-line alignment), and gap (spacing between items).

Item Properties

Each flex item can be individually configured with flex-grow (how much it should grow relative to siblings), flex-shrink (how much it should shrink), flex-basis (its initial size before growing/shrinking), align-self (override the container's align-items for this item), and order (visual order, independent of DOM order).

Common Layout Patterns

Flexbox excels at building navigation bars, centering content both horizontally and vertically, creating sidebar layouts, building card grids with equal-height cards, implementing sticky footers, and distributing space evenly among elements. Use the presets above to see these patterns in action.

Features

Browser Support

Flexbox is supported in all modern browsers. The generated CSS uses the standard syntax without vendor prefixes. Features like gap in flex containers are supported in Chrome 84+, Firefox 63+, Safari 14.1+, and Edge 84+.

Related Tools

CSS Gradient Generator

CSS Box Shadow Generator

CSS Minifier
Embed this tool on your site 
<iframe src="https://devtoolbox.dedyn.io/tools/flexbox-generator" width="100%" height="800" frameborder="0"></iframe>

Frequently Asked Questions

What is CSS Flexbox?▼
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that distributes space among items in a container and gives them powerful alignment capabilities. It works along a main axis (horizontal or vertical) and a cross axis, making it ideal for building responsive navigation bars, card layouts, centering content, and distributing space between elements without using floats or positioning hacks.
How do I center an element with Flexbox?▼
To center an element both horizontally and vertically with Flexbox, set the parent container to display: flex; justify-content: center; align-items: center;. The justify-content property centers the child along the main axis (horizontal by default) and align-items centers it along the cross axis (vertical by default). This is the simplest and most reliable way to center elements in CSS.
What is the difference between justify-content and align-items?▼
justify-content controls how flex items are distributed along the main axis (the direction set by flex-direction, which is horizontal/row by default). align-items controls how flex items are positioned along the cross axis (perpendicular to the main axis, vertical by default). For example, with flex-direction: row, justify-content handles horizontal spacing while align-items handles vertical alignment. When flex-direction is set to column, their roles effectively swap.
Keyboard Shortcuts
Ctrl+Shift+C Copy CSS
Ctrl+L Reset all