CSS Flexbox Generator

Build CSS Flexbox layouts visually. Configure flex direction, wrap, justify-content, align-items, and gap with a live preview. Free online tool.

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Preview
Generated CSS

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How to Use

  1. Adjust the flex-direction to set the main axis: row (horizontal) or column (vertical).
  2. Set flex-wrap to allow items to wrap onto multiple lines.
  3. Configure justify-content to control spacing along the main axis.
  4. Set align-items to control how items align on the cross axis.
  5. Adjust align-content for multi-line wrap behaviour.
  6. Change gap to set gutters between items.
  7. Use Items to add or remove preview boxes and see how they respond.
  8. Click Copy to copy the generated .container { … } rule.

Understanding the Generated CSS

The generator outputs a .container rule with six properties: display: flex, flex-direction, flex-wrap, justify-content, align-items, align-content, and gap. Paste it into your stylesheet and rename .container to your own class name.

Flexbox vs Grid

Use Flexbox when you have a one-dimensional layout — items along a single row or column. Use CSS Grid when you need two-dimensional control over both rows and columns simultaneously. In practice, Flexbox excels at component-level layout (navigation, button groups, form rows), while Grid is better for page-level structure.

FAQ

What is CSS Flexbox?

CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that distributes space along a single axis — either a row or a column. It is ideal for navigation bars, toolbars, card rows, centering elements, and any UI that needs items arranged along a single direction with flexible spacing.

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

justify-content controls alignment along the main axis (the direction defined by flex-direction). align-items controls alignment along the cross axis (perpendicular to the main axis). For a row flex container: justify-content aligns horizontally and align-items aligns vertically.

When should I use flex-wrap?

By default flex-wrap is nowrap — all items stay on one line, shrinking if necessary. Set flex-wrap: wrap to let items overflow onto multiple lines when they cannot fit. This is useful for responsive card grids or tag lists that should reflow at smaller widths.

What does align-content do?

align-content controls how multiple lines of flex items are distributed along the cross axis. It only has an effect when there are multiple lines (flex-wrap is set to wrap or wrap-reverse). With a single line it has no visible effect.

What is the gap property in Flexbox?

gap (shorthand for row-gap and column-gap) sets the space between flex items without adding margin to the outer edges of the container. It was originally a Grid-only property but is now fully supported in Flexbox across all modern browsers.