The CSS Flexible Box Layout, or , is a one-dimensional layout model designed to distribute space and align items within a container. Unlike traditional CSS layouts (block and inline), Flexbox is direction-agnostic and allows elements to "flex"—growing to fill unused space or shrinking to prevent overflow. 1. Core Architecture
These properties control the overall layout of the items from the parent level. Basic concepts of flexbox - CSS - MDN Web Docs CSS FLEX BOX MODEL
The model relies on two primary components: the and Flex Items . Flex Items: The direct children of that container. The Two Axes Layout behavior is determined by two perpendicular axes: The CSS Flexible Box Layout, or , is
The axis perpendicular to the main axis (e.g., if the main axis is a row, the cross axis is a column). 2. Essential Container Properties The Two Axes Layout behavior is determined by
The primary direction items are laid out (defined by flex-direction ).