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CSS Layout & Responsive Design

CSS Flexbox Generator

Build and preview CSS Flexbox layouts with real-time controls for alignment, direction, wrapping, and modern gap spacing.

  • Processed locally
  • No upload required
  • No account required

Flex Container Controls

0px - 64px
Preview Items: 5

Interactive Preview

Container min-height: 280px
#1Item 1
#2Item 2
#3Item 3
#4Item 4
#5Item 5

Generated CSS

Copy-ready CSS rules for your stylesheet

styles.cssflexbox
.flex-container {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: stretch;
  flex-wrap: nowrap;
  gap: 16px;
}

Suggested next steps

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About CSS Flexbox Generator – Visual Flexbox Layout Builder

Visually configure CSS Flexible Box layout properties with instant interactive feedback and copy-ready CSS output.

Experiment with main-axis distribution, cross-axis alignment, responsive multi-line wrapping, and modern gap spacing.

Input is processed locally in your browser and is not sent to Navorika.

How the calculation works

Flex container setup

Establishes a flex formatting context with display: flex and directional flow axes.

Distribution and alignment

Maps justify-content along the main axis and align-items along the perpendicular cross axis.

Spacing and wrapping

Controls row or column wrapping with flex-wrap and gutter spacing with modern CSS gap.

How to use this tool

  1. 1Choose the primary flex-direction (row, row-reverse, column, or column-reverse).
  2. 2Configure justify-content to distribute child items along the main axis.
  3. 3Adjust align-items to control cross-axis positioning and stretching.
  4. 4Set flex-wrap behavior and specify gap distance in pixels.
  5. 5Copy the generated CSS directly into your stylesheet.

Understanding the result

display: flex turns direct children into flex items adhering to flex formatting rules.

gap replaces legacy negative margins, creating uniform spacing between adjacent flex items.

align-items: stretch causes items to fill the container height unless an explicit cross-axis size is set.

Important limitations

  • Focuses on container-level Flexbox properties; individual child flex-grow, flex-shrink, and order rules require manual CSS.
  • Preview dimensions are illustrative and may differ from your final responsive component container.
  • Browser support for gap in Flexbox requires modern browsers (Chrome 84+, Safari 14.1+, Firefox 63+).

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Frequently asked questions

What is the difference between justify-content and align-items?

justify-content controls alignment along the main axis (horizontal in row mode), while align-items controls alignment along the cross axis (vertical in row mode).

When should I use flex-wrap?

Use flex-wrap: wrap when child items should flow onto new lines rather than shrinking or overflowing when container space is constrained.

Is modern CSS gap supported in Flexbox?

Yes. The gap property is supported in all modern browsers and replaces older negative-margin grid hacks.

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