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Key Features
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Flexbox layout depends on five properties working together — direction, justify-content, align-items, wrap, and gap — and remembering exactly which property controls which axis is one of the most common points of confusion when writing flexbox CSS from memory.
This generator builds a complete flex container declaration from your chosen layout options.
How it works
Choose the flex direction, justify-content (main-axis alignment), align-items (cross-axis alignment), flex-wrap behavior, and an optional gap. The generator assembles all five properties (plus <code>display: flex;</code>) into a single ready-to-use CSS block.
- Enter flex direction.
- Enter justify content.
- Enter align items.
- Enter flex wrap.
- Enter gap (px, optional).
- Click Calculate to see your results.
Examples
Centered row layout
A row direction with center justify-content and center align-items centers flex items both horizontally and vertically within the container.
Who should use it
- Quickly scaffolding a flexbox layout without looking up property names and values from memory.
- Learning how flexbox's core properties combine to produce a given layout.
Industry applications
- Web design and front-end development
- Responsive web design
Advantages
- Generates all five key flexbox container properties together in one block.
- Covers the full range of justify-content and align-items options.
Limitations
- Only generates container-level properties — doesn't cover individual flex item properties like flex-grow or order.
Common mistakes to avoid
- Confusing which axis justify-content versus align-items controls — this flips depending on whether flex-direction is row or column.
- Forgetting flex-wrap: wrap when a row of items needs to wrap onto multiple lines on smaller screens.
Best practices
- Remember that switching flex-direction to column swaps which axis justify-content and align-items each control — re-check your alignment choices whenever you change direction.
Tips
- For a responsive layout where items should wrap onto new rows on narrow screens, combine flex-wrap: wrap with a gap value instead of individual item margins — it handles spacing consistently even as items wrap.