DevToolKit

CSS Flexbox Generator

Design flexible layouts with our interactive CSS Flexbox generator. Visualize container and item properties in real-time and export clean, production-ready code.

Interactive Layout

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CSS Output

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

Container Properties

16px
Click an item in the sandbox to edit its individual properties
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How to Use

Designing responsive layouts is made visual with our interactive sandbox:

Generator Guide

  1. Configure Container: Use the Direction, Justify, and Align dropdowns to set the global layout rules.
  2. Add/Remove Items: Click Add Item to insert more boxes into the sandbox. Use the trash icon on active items to remove them.
  3. Edit Specific Items: Click on any numbered box in the sandbox to open its individual properties (like Flex Grow or Align Self).
  4. Adjust Spacing: Move the Gap slider to precisely control the space between items.
  5. Export Code: Copy the generated CSS for both the .flex-container and individual .flex-item classes.

About This Tool

Visual Layout Design

Flexbox is the foundation of modern web layouts. While the logic is consistent, visualizing how properties like flex-grow or space-between will behave with dynamic content can be difficult.

This tool provides a "playground" where you can experiment with complex alignments and proportions in real-time, ensuring your final CSS is both accurate and efficient.

FAQ

What is CSS Flexbox?
Flexbox (Flexible Box Layout) is a CSS3 layout mode that provides an easy and clean way to arrange elements within a container, even when their size is unknown or dynamic. It excels at distributing space and aligning items in one dimension (rows or columns).
When should I use Flexbox vs Grid?
Flexbox is designed for one-dimensional layouts (either a row OR a column). CSS Grid is designed for two-dimensional layouts (rows AND columns simultaneously). Use Flexbox for components like navigation bars, headers, or simple lists.
What does 'flex-grow' do?
The 'flex-grow' property defines the ability for a flex item to grow if necessary. It accepts a unitless value that serves as a proportion. It dictates what amount of the available space inside the flex container the item should take up.
How do I center an item with Flexbox?
To perfectly center an item, set 'justify-content: center' (horizontal centering in a row) and 'align-items: center' (vertical centering in a row) on the parent container.
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