CSS Flexbox Visualizer
Build Flexbox layouts interactively. Adjust container and item properties, see the live preview update instantly, then copy the generated CSS.
Frequently Asked Questions
What is CSS Flexbox?▼
Flexbox (Flexible Box Layout) is a CSS layout model that lets you arrange items in a row or column, distribute space, and align elements — even when their sizes are unknown. It's the foundation of most modern responsive UIs.
What does flex-direction do?▼
'row' places items left-to-right (default). 'row-reverse' places them right-to-left. 'column' stacks items top-to-bottom. 'column-reverse' stacks them bottom-to-top. The direction also changes the meaning of the main axis and cross axis.
What is the difference between justify-content and align-items?▼
justify-content aligns items along the main axis (the direction flex-direction points). align-items aligns items along the cross axis (perpendicular to main axis). For row direction: justify-content = horizontal, align-items = vertical.
When should I use flex-grow vs flex-basis?▼
flex-basis sets the initial size of an item before free space is distributed. flex-grow determines how much of the remaining free space an item absorbs. Use flex-basis to set a starting size and flex-grow to allow expansion. A common pattern: flex: 1 (shorthand for flex-grow:1, flex-shrink:1, flex-basis:0%) makes all items share space equally.
How do I copy the generated CSS?▼
Click the 'Copy CSS' button at the bottom. The code includes the container styles and any per-item overrides you've configured. Paste it directly into your stylesheet.
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