What's the difference between Flexbox and Grid?

Flexbox is one-dimensional — it lays out items along a single axis, either a row or a column at a time. Grid is two-dimensional and handles rows and columns simultaneously. The practical division is that Flexbox excels at component-level work like navigation bars, card lists, and content distribution within a section, while Grid handles full page layouts and complex two-axis arrangements like dashboards. Most real pages use both at different levels of the layout tree.

How do I center content with Flexbox?

Two declarations on the parent — display: flex, justify-content: center, align-items: center — center children both horizontally and vertically. This is the famous solution to the 'how to vertically center a div' problem that haunted CSS for years before Flexbox existed. It replaces translate hacks, table-cell tricks, and the various margin-auto contortions that came before.

What's flex shorthand?

The flex property is shorthand for grow, shrink, and basis combined. 'flex: 1' expands to grow=1, shrink=1, basis=0%, meaning the item takes an equal share of available space. 'flex: 0 0 200px' produces a fixed 200px column that neither grows nor shrinks. 'flex: 1 1 300px' means the item should be at least 300px but can grow to fill remaining space. Those three patterns cover most real-world cases.

What is gap in Flexbox?

The gap property sets spacing between flex items in a single declaration — gap: 1rem puts 1rem of space between every pair of children. Browser support has been universal since around 2021, and it replaces the margin and padding workarounds that used to be the only option. Clean, consistent, and avoids the 'last item has an extra margin' problem that always came with the older approaches.

How do I make Flexbox responsive?

The standard pattern is to switch flex-direction from row on desktop to column on mobile inside a media query. For wrapping layouts, flex-wrap: wrap combined with a flex value like flex: 1 1 300px on each child produces cards that go single-column on small screens and multi-column on larger ones, all without a media query. Mobile-first design tends to favor the wrap-based approach because it scales smoothly.

It lets a specific flex item override the parent's align-items value for itself. By default each item inherits from the parent, but adding align-self: flex-start to one item makes it align differently from the rest. Useful when you want one card to stick to the top while siblings stretch, or one element to break the alignment pattern of the row for emphasis.

Is the data sent anywhere?

No. The Flexbox playground generates its CSS entirely in client-side JavaScript and never sends your design choices to a server. The output is just a string of CSS that lives in your browser until you copy it out.

Flexbox Generator

Build CSS flexbox layouts visually online with interactive controls. Free flexbox generator with direction, alignment, and CSS output.

Generators CSS Tools

Instant results

Flex Direction

Justify Content

Align Items

Flex Wrap

Gap: 16px

Items: 4

CSS

display: flex;
flex-direction: row;
justify-content: flex-start;
align-items: stretch;
flex-wrap: nowrap;
gap: 16px;

Tailwind CSS

flex gap-4

Preview

About Flexbox Generator

Generate CSS Flexbox layouts with a visual editor. Experiment with flex-direction, justify-content, align-items, wrap, and gap properties. Get both standard CSS and Tailwind CSS output.

How to Use Flexbox Generator

Configure container properties

Set the parent's flex-direction (row or column), then choose how children distribute along the main axis with justify-content and how they line up against the cross axis with align-items. Toggle flex-wrap when you want children to flow onto multiple lines, and use gap to control spacing between them. The live preview updates as you go, so you can see exactly what each setting does.

Configure children (optional)

Most layouts work with just container properties, but you can also set per-child behavior. The flex shorthand combines grow, shrink, and basis into one declaration — flex: 1 spreads children evenly, flex: 0 0 200px produces fixed-width columns. align-self lets one item break the row's vertical alignment, which is handy when you want a single card sticking to the top while siblings stretch.

Preview the layout

The visual preview shows sample boxes arranged according to your settings. Resize the preview pane to test how the layout responds to narrower screens, especially if you've enabled flex-wrap. Pay attention to how children grow, shrink, and wrap because that's where most surprises come from.

Copy CSS

The generated CSS covers both container and child rules in a single block. Paste it directly into your stylesheet. Browser support has been universal across modern browsers since 2017, so you can drop vendor prefixes and ship the output as-is.

When to Use Flexbox Generator

Modern layout building

Navigation bars, card grids, centered content, and equal-height columns are the bread and butter of modern web layout, and Flexbox handles all of them in a few lines that would have taken much more code in the float era. The visual playground is faster than memorizing the property names — you tweak the controls, watch the preview, and copy CSS that already works. Frontend developers and designers picking up modern CSS use it as both a reference and a sandbox.

Responsive design

A common responsive pattern is to lay items out in a row on desktop and stack them in a column on mobile. Flipping flex-direction inside a media query handles that without rewriting the rest of the layout, and the playground makes it easy to preview both states. Mobile-first designers in particular tend to lean on this for hero sections, feature lists, and product cards.

Centering content

Vertical centering used to require absolute positioning and translate hacks, table-cell tricks, or auto margins set up just so. With Flexbox, justify-content: center and align-items: center on the parent does it in two lines, which is why it became the standard answer the moment browser support landed. Hero sections, modals, login screens, and any 'center this icon in its container' problem all collapse to the same two-line solution.

Educational learning

Flexbox has roughly a dozen container properties and another handful for children, and the interactions between them aren't always obvious from the spec. Watching the preview update as you change justify-content from flex-start to space-between, or seeing what flex: 1 1 200px actually does when the viewport is narrow, builds intuition much faster than reading docs. It's a useful companion for bootcamp students, self-learners, and anyone prepping for an interview that involves 'how would you center this'.

Flexbox Generator Examples

Navbar layout

Input

Direction: row, Justify: space-between, Align: center

Output

.navbar { display: flex; justify-content: space-between; align-items: center; }

The classic nav arrangement — a logo or brand on the left, links pushed to the right, both vertically centered against the bar. space-between handles the horizontal distribution by pushing the first and last items to the edges, and align-items: center handles the vertical alignment without any height calculations.

Card grid

Input

Direction: row, wrap, gap: 1rem, justify: flex-start

Output

.grid { display: flex; flex-wrap: wrap; gap: 1rem; }\n.card { flex: 1 1 300px; }

A responsive card layout where cards wrap to a new row once they fill the available width. The flex: 1 1 300px shorthand on each card means 'be at least 300px wide, grow to fill remaining space.' On a wide screen you get four columns, on a narrow one you get one — without writing a single media query.

Centering everything

Input

Justify: center, Align: center

Output

.container { display: flex; justify-content: center; align-items: center; }

The two-line answer to the vertical-centering problem that haunted CSS for a decade. The same pattern works for full-page hero sections, modal overlays, loading spinners, and tiny icon-in-button cases. Once you internalize it, you stop reaching for translate hacks.

Tips & Best Practices for Flexbox Generator

1.Mind the axis. With flex-direction: row, justify-content controls horizontal alignment and align-items controls vertical. Switch to column and the two swap roles, which trips up almost everyone the first time.
2.Reach for gap before margin. 'gap: 1rem' on the container puts consistent spacing between every child, with no awkward 'how do I avoid the margin on the last item' workarounds. Browser support has been universal since 2021.
3.Memorize the flex shorthand patterns. flex: 1 means equal share of remaining space. flex: 0 0 200px means a fixed 200px column that won't grow or shrink. flex: 1 1 300px means responsive with a sensible minimum. Those three cover most needs.
4.Use Grid for two-dimensional layouts. Flexbox is fundamentally one-dimensional — it lays out along a single axis. Once you need control over both rows and columns simultaneously (a dashboard, a magazine layout), Grid is the better tool.
5.Avoid setting fixed widths on flex children. Use the flex property instead, which lets children participate in the parent's distribution rules. Mixing flex-wrap with explicit widths but no flex-basis is a common source of weird wrapping behavior.
6.Browser support is no longer a concern. Every modern browser handles Flexbox well, and IE11's partial support is now mostly irrelevant. You can drop vendor prefixes and use it freely.

Frequently Asked Questions

Flexbox — short for Flexible Box Layout — is a CSS layout system designed for one-dimensional arrangements, meaning rows or columns rather than both at once. It came along to fix a long list of problems that floats and absolute positioning handled awkwardly: vertical centering, equal-height sibling columns, responsive content distribution. The first draft of the spec dates to 2009, and full browser support arrived in 2017.

Flexbox Generator

About Flexbox Generator

How to Use Flexbox Generator

Configure container properties

Configure children (optional)

Preview the layout

Copy CSS

When to Use Flexbox Generator

Modern layout building

Responsive design

Centering content

Educational learning

Flexbox Generator Examples

Navbar layout

Card grid

Centering everything

Tips & Best Practices for Flexbox Generator

Frequently Asked Questions

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