CSS Flexbox Generator
Build flexbox layouts visually and copy production-ready CSS and HTML.
Container
flex-direction
flex-wrap
justify-content
align-items
align-content
Items (3)
Live Preview
.container {
display: flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: flex-start;
align-items: stretch;
align-content: stretch;
gap: 10px;
}
.item { /* default */ }How to Use the CSS Flexbox Generator
- 1.Choose a preset layout (Centered, Navbar, Card Grid, Sidebar) as a starting point, or configure from scratch.
- 2.Adjust the container properties: flex-direction, flex-wrap, justify-content, align-items, and gap.
- 3.Click "Add Item" to add flex children. Select an item and set its flex-grow, shrink, basis, align-self, and order.
- 4.Watch the live preview update instantly as you change each property.
- 5.Switch between CSS and HTML tabs, then click "Copy" to grab production-ready code.
What is CSS Flexbox?
Flexbox (Flexible Box Layout) is a CSS layout model designed for distributing space along a single axis — either a row or a column. The parent container (the flex container) controls how its direct children (flex items) are sized, ordered, and aligned. This makes flexbox ideal for components that need to respond to different content sizes or viewport widths.
The key properties are: flex-direction (axis direction), justify-content (alignment along the main axis), align-items (alignment along the cross axis), and flex-wrap (whether items can wrap to new lines). On individual items, flex-grow controls how much available space an item claims, and flex-basis sets its starting size before growth is applied.
Flexbox is best for one-dimensional layouts: navigation bars, button groups, form rows, card carousels, and centering content. For two-dimensional layouts where both rows and columns need independent control, CSS Grid is the better choice.
Frequently Asked Questions
When should I use Flexbox vs. CSS Grid?
Use Flexbox when you have a single row or column of items and want them to distribute or align within that space. Use Grid when you need to control placement in both dimensions simultaneously — page layouts, dashboards, and image galleries are natural Grid use cases.
What is flex: 1 shorthand?
flex: 1 is shorthand for flex-grow: 1; flex-shrink: 1; flex-basis: 0%. It tells an item to grow and shrink equally, starting from 0 and claiming an equal share of available space. It is the most common way to create equally-sized flex items.
How do I center something with Flexbox?
Set the container to display: flex; justify-content: center; align-items: center;. This centers the child both horizontally (main axis) and vertically (cross axis). This is the most reliable way to perfectly center an element in modern CSS.