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CSS Flexbox Generator

generate CSS flexbox layouts with a visual editor

By Bikram NathLast updated

A visual flexbox layout builder that outputs ready-to-paste CSS as you adjust container properties. Set `flex-direction: row` and `justify-content: space-between`, for instance, and the generated ruleset appears instantly without writing a line by hand. Unlike Grid generators, it stays focused on single-axis alignment controls: `flex-wrap`, `gap`, `align-items`, and `justify-content` for the container.

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What is CSS Flexbox Generator?

The generator renders a live flex container populated with placeholder child elements. As you toggle container-level properties, the CSS output updates to match, producing a block like `.container { display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 1rem; }` that you can drop directly into a stylesheet. Children inherit the layout without any extra rules.

Reach for this when prototyping alignment logic and you want visual feedback faster than cycling through DevTools. Flexbox Froggy teaches the same mental model through puzzles but produces no exportable CSS. Chrome DevTools' flexbox inspector (shipped in 2021) shows these properties on elements already in the DOM but requires live HTML to inspect. This generator works from a blank slate, which is faster for green-field components.

One persistent source of confusion: `align-items` controls cross-axis alignment per row. Once `flex-wrap: wrap` is active and items spill onto a second line, `align-items` still aligns items within each individual row, but `align-content` governs how those rows distribute the remaining cross-axis space. The generator covers `align-items` only, so unexpected vertical gaps in a wrapping layout usually mean you need to add `align-content` manually after exporting.

When to use CSS Flexbox Generator

✓Prototype a navigation bar's child spacing before touching your actual component file.
→Verify whether `align-items: stretch` or `baseline` is correct when mixing text and icon elements in a toolbar.
⚡Export a clean container ruleset when pairing a Tailwind project with a component library that requires vanilla CSS.

Frequently Asked Questions

Why doesn't changing `align-items` move my flex children when `flex-wrap: wrap` is also set?
With a single-line container, `align-items` positions children along the cross axis and the effect is immediate. Once `flex-wrap: wrap` is active and items overflow into a second row, the browser enters multi-line mode. `align-items` still aligns items within each individual row, but `align-content` is what controls how the rows themselves are distributed in the remaining cross-axis space. If the container height equals the natural content height there is nothing to distribute and neither property appears to do anything. Add an explicit `height` or `min-height`, then set `align-content` in your own stylesheet after exporting.
Does the generated CSS include child-level properties like `flex-grow`, `flex-shrink`, or `flex-basis`?
No. The generator covers only container properties: `display: flex`, `flex-direction`, `justify-content`, `align-items`, `flex-wrap`, and `gap`. Child properties control how individual elements grow or shrink inside the container and differ per element, so they fall outside a container-focused tool's scope. The browser default for flex children is `flex: 0 1 auto`, meaning items will not grow to fill space but will shrink below their natural size if the container is too narrow. Add `flex-grow`, `flex-shrink`, and `flex-basis` to individual child rules manually after copying the container block.
What is the practical difference between the `gap` property here and adding `margin` to each flex child?
`gap` (supported in flex contexts since Chromium 84, Firefox 63, and Safari 14.1) applies spacing only between items, never on the outer edges of the container. `margin` on children adds space on every side unless you cancel it with negative margin on the container, a common workaround before `gap` landed in Safari. For projects targeting modern browsers, `gap` is cleaner and avoids first-child and last-child margin hacks. If you need to support Safari 14.0 or older Android WebView builds, verify coverage on Can I Use before relying on flex `gap`.
Why does `justify-content: space-between` look identical to `flex-start` when there is only one flex child?
`space-between` places remaining space between items. With a single child there are no gaps between items, so the property has no space to distribute and the child sits at the main-axis start, visually the same as `flex-start`. This is correct behavior per the CSS Flexible Box Layout specification. To center a lone child, use `justify-content: center`, or keep the default and apply `margin: auto` to the child itself, which absorbs all available space on both sides without changing the container rule.
When should I use this instead of the CSS Grid Generator on the same site?
Flexbox is a one-dimensional model: it arranges items along a single main axis with optional wrapping. Use this generator for navigation bars, tag rows, centered hero blocks, or wrapping card strips where row height should adapt to content. CSS Grid is a two-dimensional model with explicit rows and columns. Use the Grid Generator when you need named areas, fixed column tracks, or items in different components that must align on the same grid lines. A common production pattern is Grid for the page skeleton and Flexbox for the components inside each grid cell.

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