Developer Tools

Flexbox Generator

Generate CSS Flexbox layout code. Calculate flex properties for responsive layouts with justify-content and align-items.

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About this tool

CSS Flexbox simplifies responsive layouts. Our Flexbox Generator creates flex container code with all the properties you need for modern layout design.

Flexbox handles alignment, distribution, and ordering of items in one dimension. Perfect for navigation bars, card layouts, centering elements, and responsive designs.

Usage examples

Center Content

Perfect center alignment

display: flex; justify-content: center; align-items: center;

Navigation Bar

Horizontal menu with spacing

display: flex; justify-content: space-between; align-items: center;

How to use

  1. Select "Flex Direction" (row, column).
  2. Choose "Justify Content" (alignment on main axis).
  3. Select "Align Items" (alignment on cross axis).
  4. Click "Generate" to get CSS Flexbox code.

Benefits

  • CSS Flexbox code
  • All flex properties
  • Responsive layouts
  • Easy alignment
  • One-dimensional layouts
  • Copy-paste ready

FAQs

What is CSS Flexbox?

Flexbox (Flexible Box Layout) is a CSS layout method for arranging items in one dimension (row or column). Properties: display: flex; (container), justify-content (main axis), align-items (cross axis), flex-direction, flex-wrap. Replaces floats and positioning for most layouts.

When should I use Flexbox vs Grid?

Use Flexbox for: one-dimensional layouts (rows OR columns), navigation menus, card layouts, centering elements, content-first designs. Use Grid for: two-dimensional layouts (rows AND columns), page layouts, complex grids, layout-first designs. Can combine both!

What is justify-content vs align-items?

justify-content: aligns items along main axis (horizontal in row, vertical in column). Values: flex-start, center, flex-end, space-between, space-around. align-items: aligns items along cross axis (vertical in row, horizontal in column). Values: flex-start, center, flex-end, stretch, baseline.

How do I center a div with Flexbox?

Perfect centering: display: flex; justify-content: center; align-items: center; Works vertically and horizontally. Parent must have defined height for vertical centering. Simpler than old methods (position: absolute, transform, table-cell). Works for single or multiple items.

What is flex-grow, flex-shrink, flex-basis?

Flex properties on items: flex-grow (how much to grow, 0 = no grow), flex-shrink (how much to shrink, 1 = allow shrink), flex-basis (initial size before growing/shrinking). Shorthand: flex: 1; means flex: 1 1 0%; (grow, shrink, basis). Use for responsive sizing.

How do I create equal-width columns with Flexbox?

Equal columns: .item { flex: 1; } on all items. They'll share space equally. For 3 columns: .item { flex: 1 1 33.333%; } with flex-wrap: wrap; For gap between items, use gap: 20px; on parent (modern) or margin on items (older browsers).

Can Flexbox create responsive layouts without media queries?

Yes! Use flex-wrap: wrap with flex-basis on items. Example: .item { flex: 1 1 300px; } wraps items when container is smaller than combined min-widths. Combines with gap for automatic responsive grids. Media queries still useful for major breakpoints and different layouts.

How do I vertically center with Flexbox?

For parent: display: flex; align-items: center; (cross-axis) and justify-content: center; (main-axis). Parent must have defined height. For single item, can also use margin: auto; on the child. Flexbox makes vertical centering trivial compared to old methods (absolute positioning, table-cell, etc.).

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