CSS Flexbox Generator [2025]

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Visually design flexible layouts using CSS Flexbox. Control container and item properties with an interactive preview.

✓ Live Preview✓ Container Controls✓ Item Controls✓ Add/Remove Items✓ Instant CSS Code

Flexbox Controls

Only applies when Wrap is active.

10px

Click an item in the preview to select it.

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Live Preview

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Click items to select and modify their individual properties.

Generated CSS

.flex-container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: flex-start;
  align-items: stretch;
  /* align-content only applies when flex-wrap is wrap or wrap-reverse */
  gap: 10px; /* Use gapUnit */
  /* Consider adding width & height here if desired */
  /* width: 100%; */
  /* height: 350px; */
}

.flex-item {
  /* Default item styles */
  order: 0;
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  align-self: auto;
  /* Add other base item styles like padding, background, color etc. */
  padding: 20px; /* Example */
  background-color: #cbd5e1; /* Example */
  border: 1px solid #94a3b8; /* Example */
  text-align: center; /* Example */
}

Apply `.flex-container` to the parent and `.flex-item` to children. Use specific `.item-ID` classes for overrides.

What is CSS Flexbox?

The CSS Flexible Box Layout Module, commonly known as Flexbox, is a one-dimensional layout model designed for arranging items in rows or columns. It provides powerful alignment and space distribution capabilities for items within a container, even when their size is unknown or dynamic.

Flexbox consists of a **flex container** (the parent element with `display: flex`) and **flex items** (the direct children of the container). You apply properties to the container to control the overall flow and alignment, and properties to the items to control their individual size, order, and alignment.

It's ideal for component-level layouts, navigation bars, form controls, and distributing space along a single axis.

Key Flexbox Properties

Container Properties

  • flex-direction: Sets the main axis (row or column).
  • flex-wrap: Controls if items wrap to multiple lines.
  • justify-content: Aligns items along the main axis.
  • align-items: Aligns items along the cross axis (single line).
  • align-content: Aligns lines along the cross axis (multi-line).
  • gap: Sets spacing between items.

Item Properties

  • order: Changes the visual order of items.
  • flex-grow: Allows item to grow if space is available.
  • flex-shrink: Allows item to shrink if space is limited.
  • flex-basis: Defines the default size before distributing space.
  • align-self: Overrides container's `align-items` for one item.
  • flex: Shorthand for grow, shrink, and basis.

Flexbox vs. Grid

Flexbox and CSS Grid are both powerful layout modules, but they excel in different scenarios:

  • Flexbox (1D): Best for arranging items along a single line (a row OR a column). Ideal for component layouts, navigation, aligning items within a container. Think "content-first" distribution.
  • Grid (2D): Best for creating two-dimensional layouts with explicit rows AND columns. Ideal for overall page structure, complex dashboards, aligning items in both dimensions simultaneously. Think "layout-first" structure.

They often work well together! You might use Grid for the main page layout (header, sidebar, content, footer) and Flexbox within those sections to arrange smaller components.

Frequently Asked Questions

How do I use the generated CSS?

Copy the CSS code. Apply the `.flex-container` class to your parent HTML element. Apply the `.flex-item` class to its direct children. If you modified individual item properties (like `order` or `flex-grow`), apply the corresponding `.item-ID` class (e.g., `.item-1`) to that specific child element *in addition* to `.flex-item`.

Why doesn't `align-content` do anything sometimes?

The `align-content` property only has an effect when there are multiple lines of flex items, which happens when `flex-wrap` is set to `wrap` or `wrap-reverse` and the items actually wrap onto new lines. If `flex-wrap` is `nowrap`, or if all items fit on a single line, `align-content` has no effect.

What does `flex-basis: auto` mean?

When `flex-basis` is `auto`, the item's initial size is typically determined by its content or its explicit `width`/`height` property before free space is distributed according to `flex-grow` and `flex-shrink`.

Is Flexbox supported in all browsers?

Yes, Flexbox has excellent support across all modern desktop and mobile browsers. Older versions of Internet Explorer (10 and 11) had partial support with different syntax, but standard Flexbox is safe to use for the vast majority of users today.

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