CSS Flexbox Generator
CSS Flexbox layouts arrange items in rows or columns with flexible sizing. Set display: flex on container. Key properties: flex-direction (row/column), justify-content (alignment along main axis), align-items (alignment along cross axis), gap (spacing). flex: 1 makes items grow equally. flex-wrap allows wrapping. Common patterns: centered content (justify-content: center; align-items: center), space-between navigation, responsive card grids.
Create CSS Flexbox layouts visually with a live preview. Configure flex-direction, justify-content, align-items, flex-wrap, and gap. Add child items with individual flex-grow, flex-shrink, flex-basis, order, and align-self. Includes presets for centered content, navigation bar, card layout, holy grail, and sidebar layouts. Copy generated CSS code instantly.
Presets
Container Properties
Live Preview
Click an item to select it and edit its properties below.
Child Items
Generated CSS
.container {
display: flex;
gap: 8px;
}How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- What is CSS Flexbox?
- CSS Flexbox (Flexible Box Layout) is a one-dimensional layout system that distributes space among items in a container along a single axis (row or column). It excels at aligning items, distributing space, and handling dynamic content sizes. Unlike CSS Grid which is two-dimensional, Flexbox focuses on one direction at a time, making it ideal for navigation bars, card rows, centering content, and component-level layouts.
- What is the difference between Flexbox and CSS Grid?
- Flexbox is one-dimensional — it lays out items along a single axis (row or column). CSS Grid is two-dimensional — it handles rows and columns simultaneously. Use Flexbox for component-level layouts like navigation bars, button groups, and centering. Use Grid for page-level layouts like dashboards and complex multi-area designs. They work great together — Grid for the overall page structure and Flexbox for individual components within grid areas.
- What does flex-grow do?
- flex-grow determines how much a flex item should grow relative to other items when extra space is available. A value of 0 (default) means the item will not grow. If one item has flex-grow: 1 and another has flex-grow: 2, the second item takes twice as much of the available space. flex-grow only distributes leftover space after items reach their base size (flex-basis).
- What is the difference between justify-content and align-items?
- justify-content controls alignment along the main axis (horizontal in row direction, vertical in column direction). align-items controls alignment along the cross axis (perpendicular to the main axis). For a row layout: justify-content handles horizontal spacing, align-items handles vertical alignment. Common values include flex-start, flex-end, center, space-between, and stretch.
- How do I center an element with Flexbox?
- To center an element both horizontally and vertically with Flexbox, set the parent container to display: flex; justify-content: center; align-items: center. This works regardless of the child element size. For horizontal-only centering in a row, use justify-content: center. For vertical-only centering, use align-items: center.
- What does flex-basis do?
- flex-basis sets the initial size of a flex item before flex-grow and flex-shrink are applied. It defaults to "auto", which uses the item's content size or explicit width/height. You can set it to a specific value like 200px, 50%, or 0. When flex-basis is 0, the item's space is determined entirely by flex-grow. The shorthand "flex: 1" is equivalent to "flex-grow: 1; flex-shrink: 1; flex-basis: 0%".
- How do I make a responsive layout with Flexbox?
- Use flex-wrap: wrap so items wrap to new lines when the container is too narrow. Set flex-basis to a minimum width (e.g., 250px) so items maintain a readable size. Combine with flex-grow: 1 to let items fill available space. Media queries can change flex-direction from row to column on mobile. The gap property adds consistent spacing between items without margin hacks.