What is the difference between space-between and space-evenly?

space-between places the first item at the start edge and the last item at the end edge with equal spacing between inner items. space-evenly distributes equal whitespace between all items and around the outer edges.

Is CSS flexbox gap supported in all modern browsers?

Yes. The flexbox gap property has been universally supported across all major browsers (Chrome, Edge, Firefox, Safari) since 2021.

Design & CSS

Interactive CSS Flexbox Sandbox & Code Generator

The problem: Memorizing the complex interplay of flexbox main axis vs cross axis and alignment properties slows down frontend development.

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100% In-Browser Execution. Zero server uploads. Your data never leaves this tab — disconnect your internet and the tool keeps working.

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100% In-Browser Execution. Zero server uploads. Your data never leaves this tab — disconnect your internet and the tool keeps working.

Interactive Flex Containergap: 16px | 4 items

Box 1

Box 2

Box 3

Box 4

Flexbox Layout Directives

flex-direction

justify-content

align-items

Gap: 16px

Boxes: 4

Standard CSS

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

Tailwind CSS Classes

flex flex-row justify-center items-center flex-wrap gap-[16px]

Interactive CSS Flexbox Sandbox & Code Generator: the complete guide

An Interactive CSS Flexbox Sandbox and Code Generator visualizes flex container layout rules, alignment properties, and item distributions with live interactive previews. CSS Flexible Box Layout (Flexbox) is the fundamental standard for one-dimensional web interface design, but memorizing the interplay between justify-content, align-items, flex-direction, and flex-wrap can be tricky. This playground allows developers to visually configure layouts and copy both standard CSS and Tailwind CSS classes.

Understanding the Main Axis vs. Cross Axis

The core concept of Flexbox is the distinction between the main axis and cross axis. When flex-direction is 'row', the main axis runs horizontally (controlled by justify-content) and the cross axis runs vertically (controlled by align-items). Switching flex-direction to 'column' rotates these axes by 90 degrees, causing justify-content to control vertical alignment.

Modern CSS Gap vs. Legacy Margin Hacks

Historically, creating consistent spacing between flex items required negative margins on parents and child padding hacks. Modern CSS natively supports the 'gap' property inside flex containers, establishing uniform gutters between rows and columns without leaking outer margin bleed.

Step by step: how to use Flexbox Sandbox

1
Select your container's flex-direction (row, column, or reversed).
2
Configure justify-content to distribute items along the main axis.
3
Adjust align-items to control cross-axis alignment (stretch, center, start, end).
4
Use the Gap slider to dial in precise pixel gutters between child elements.
5
Copy standard CSS rules or utility-first Tailwind CSS class equivalents with 1 click.

Security & privacy

Client-side CSS generator. All layout changes are applied via inline styles in local DOM memory. No CSS stylesheets or UI templates are tracked remotely.