ZenovayTools

CSS Flexbox Generator

Build CSS flexbox layouts visually. Configure container and item properties with a live preview and copy the generated CSS.

Presets

12px
4
Live Preview

Click any item to edit its properties

Generated CSS

How to Use CSS Flexbox Generator

  1. 1Set container properties: direction, justify, align, wrap, and gap.
  2. 2Add or remove child items in the live preview.
  3. 3Configure per-item flex-grow, shrink, basis, and order.
  4. 4Copy the generated CSS for your project.
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Frequently Asked Questions

What is CSS Flexbox and when should I use it?▾
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that distributes space and aligns items inside a container, even when their sizes are unknown or dynamic. Use Flexbox when you need to lay out items along a single axis — a row of nav links, a column of cards, or centering content both horizontally and vertically. For two-dimensional grid layouts, use CSS Grid instead.
What does flex-direction control?▾
flex-direction sets the main axis of the flex container, which determines how child items are placed. "row" (default) places items left-to-right; "row-reverse" reverses that. "column" stacks items top-to-bottom; "column-reverse" stacks them bottom-to-top. Changing flex-direction also swaps what justify-content and align-items control — justify-content always works on the main axis, and align-items always works on the cross axis.
What is the difference between justify-content and align-items?▾
justify-content distributes space along the main axis (horizontal for row, vertical for column). Common values: flex-start, flex-end, center, space-between, space-around, space-evenly. align-items controls alignment on the cross axis (perpendicular to main). Common values: flex-start, flex-end, center, stretch (fills container height/width), and baseline (aligns text baselines). align-self on an individual child overrides align-items for that item only.
What does flex-wrap do and when should I enable it?▾
By default (nowrap), flex items try to fit on a single line and may overflow or shrink below their content size. Setting flex-wrap: wrap allows items to flow onto new lines when they run out of space, creating a responsive multi-row (or multi-column) layout. wrap-reverse does the same but stacks new lines in the opposite direction. Wrapping is ideal for card grids, tag lists, or any layout where the number of items is variable.
What are flex-grow, flex-shrink, and flex-basis?▾
These three properties control how a flex item sizes itself relative to the container and siblings. flex-basis sets the initial size before free space is distributed (similar to width for row direction). flex-grow (default 0) determines how much of the remaining free space an item takes — a value of 1 shares it equally with other grow-1 siblings. flex-shrink (default 1) controls how much an item shrinks when there is not enough space. The shorthand "flex: 1" is equivalent to "flex-grow: 1; flex-shrink: 1; flex-basis: 0%", making items share space equally.