CSS Flexbox Generator

Build a flex layout visually, copy the declarations, and verify wrapping and intrinsic-width behavior before reuse.

Direction

Wrap

Justify content

Align items

Gap (px)

Preview items

Container CSS

Production CSS handoff

Review the CSS you will actually ship

This panel stays locked until you review the generated output above. It checks output shape, feature dependencies, motion/fallback concerns and creates a copy-ready component handoff.

Waiting for generated CSS

Output shapeLocked

Declarations—

UTF-8 bytes—

Browser preflightGenerate first

Features detected

Production findings

Copy-ready handoff

Generated component handoff will appear here.

Browser support is checked against the browser running this page, not every browser you support. Treat this as a production preflight, then test the copied CSS in your real component, content, cascade and target browser matrix.

Flexbox Generator: Item Controls & CSS/HTML Export

Build Flexbox visually, tune per-item grow, shrink, basis and order, then copy combined CSS and matching HTML.

Selected item #

grow / shrink

basis

order

align-self

What this CSS result proves

Flex alignment is only half the layout story.

What to review before production

Test wrapping, intrinsic widths and min-width behavior with the real children that will ship.

Practical guide and verification

Use the tool first, then apply these checks to verify the inputs, interpret the result, and hand it off without displacing the primary workflow.

Test both container and item rules

Container alignment can look correct with identical demo boxes while real content fails because one item has a different flex-basis, min-content size, grow factor, or order. Use the per-item controls and representative content before copying the final rule.

Check wrapping at realistic widths

A desktop preview alone does not show where a row wraps or whether a long label forces overflow. Resize the preview or test the copied CSS at narrow widths, zoomed text, and the actual component constraints before treating the layout as production-ready.

Remember that align-content needs multiple flex lines

align-content has no visible effect on a single nowrap line. If a copied declaration seems ineffective, first check whether wrapping is enabled and whether more than one flex line actually exists. This is a layout condition, not a browser failure.

Audit intrinsic sizing before forcing fixed widths

Flex items have automatic minimum-size behavior that can prevent expected shrinking. Long unbreakable text, images, and nested components can therefore overflow even when flex-shrink is nonzero. Test min-width, overflow, and content behavior in the real component rather than solving every case with a fixed pixel width.