Flexbox (Flexible Box Module) is a CSS layout model that arranges items in a single dimension — either a row or a column. It provides powerful alignment and distribution capabilities compared to older layout methods.

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

justify-content aligns items along the main axis (the direction of flex-direction), while align-items aligns items along the cross axis (perpendicular to flex-direction).

When should I use flex-wrap?

Use flex-wrap: wrap when you want flex items to wrap onto multiple lines if they overflow the container. By default, flex items stay on a single line and may shrink.

CSS Flexbox Generator

Interactive CSS flexbox playground with live preview and copyable CSS code.

flex-direction

justify-content

align-items

flex-wrap

gap8px

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CSS (container)

display: flex;
flex-direction: row;
justify-content: flex-start;
align-items: stretch;
flex-wrap: nowrap;
gap: 8px;

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FAQ

What is CSS Flexbox?: Flexbox (Flexible Box Module) is a CSS layout model that arranges items in a single dimension — either a row or a column. It provides powerful alignment and distribution capabilities compared to older layout methods.
What is the difference between justify-content and align-items?: justify-content aligns items along the main axis (the direction of flex-direction), while align-items aligns items along the cross axis (perpendicular to flex-direction).
When should I use flex-wrap?: Use flex-wrap: wrap when you want flex items to wrap onto multiple lines if they overflow the container. By default, flex items stay on a single line and may shrink.

The CSS Flexbox Generator lets you experiment with all major flex container properties: flex-direction, justify-content, align-items, flex-wrap, and gap. A live preview shows colored child boxes rearranging in real time as you change settings. Copy the generated CSS container code instantly.