CSS Flexbox Generator

What is a CSS Flexbox Generator?

Flexbox is the CSS layout model for arranging items in one dimension — a row or a column — with powerful control over alignment, spacing, and wrapping. Its properties interact in ways that can be hard to memorize. A Flexbox generator lets you experiment visually and see the resulting CSS immediately.

Our CSS Flexbox Generator provides controls for every key container property and renders live items so you can watch exactly how flex-direction, justify-content, align-items, flex-wrap, and gap affect the layout, then copy the CSS.

Key Flexbox Properties

• flex-direction — lays items in a row or column (and reversed)
• justify-content — distributes items along the main axis
• align-items — aligns items on the cross axis
• flex-wrap — allows items to wrap onto multiple lines
• gap — sets consistent spacing between items

Main Axis vs Cross Axis

The single most important Flexbox concept is the difference between the main axis and the cross axis. The main axis runs in the direction set by flex-direction; justify-content aligns items along it. The cross axis is perpendicular; align-items aligns items along it.

When you switch flex-direction from row to column, the axes swap — which is why justify-content and align-items appear to trade places. Seeing this live in the preview makes the concept click far faster than reading about it.

Why Use Flexbox?

Flexbox is ideal for one-dimensional layouts: navigation bars, button groups, card rows, centering content, and distributing space. It elegantly solves problems that were painful with floats and positioning, like vertical centering and equal-spacing. This generator helps you learn and apply it without trial and error in your editor.