CSS Flexbox Generator
Generate CSS Flexbox layouts visually. Align items, distribute space, and manage responsive behavior with the Flexible Box Module.
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Flexbox is the modern CSS solution for one-dimensional layouts — rows or columns of content that need to align, distribute space, and respond to different screen sizes without relying on the float or inline-block hacks of the past. Every front-end developer uses Flexbox for navigation bars, centered content, card grids, form layouts, sidebar-and-main patterns, stacked mobile layouts, toolbars, and virtually any component that lives in a single row or column. It is the foundation of virtually every CSS framework and component library built in the last decade.
How Flexbox Works — Main Axis vs. Cross Axis
Every flex container has two axes: the main axis (defined by flex-direction) and the cross axis (perpendicular to it). When flex-direction is row, the main axis runs horizontally; when column, it runs vertically. justify-content controls alignment along the main axis — use flex-start, flex-end, center, space-between, space-evenly, or space-around to distribute children. align-items controls alignment along the cross axis for all children at once; align-self overrides it for individual items. align-content only takes effect when flex-wrap is active and there are multiple lines of items — it distributes those lines along the cross axis and does nothing in a single-line flex container, which is a common gotcha for beginners.
Fun Fact: The CSS Flexible Box Layout Module (Flexbox) was first proposed in 2009 and went through several syntax iterations before reaching its stable form in 2015. The original 2009 draft used display: box and properties like box-flex, box-ordinal-group, and box-orient — nearly unrecognizable from the clean display: flex we use today. Flexbox solved the 'holy grail' three-column layout that had plagued web developers for over a decade, and it was the first CSS layout method to natively support vertical centering without hacks.
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