Flexbox Builder

Visual CSS flexbox playground

flex-directionjustify-contentalign-itemsflex-wrap

Gap12px

Items4

1

2

3

4

CSS

display: flex;
flex-direction: row;
justify-content: center;
align-items: center;
flex-wrap: nowrap;
gap: 12px;

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About the Flexbox Builder

Learn and prototype CSS flexbox layouts visually. Change flex-direction, justify-content, align-items, wrap, and gap and watch numbered boxes rearrange live — then copy the exact CSS. A faster way to internalize flexbox than reading documentation.

How to use

1Adjust direction, justification, and alignment dropdowns.
2Tune gap and item count with sliders.
3Copy the generated flex container CSS.

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Flexbox Builder is part of DevKit — 100 free, privacy-first tools for developers, students, and everyone, built by Minhazul Ashim. Everything runs in your browser; your data never leaves your machine.