This property specifies how flex items are laid out in the flex container, by setting the direction of the flex container’s main axis. They can be laid out in two main directions, like rows horizontally or like columns vertically.
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A Visual Guide to CSS3 Flexbox Properties
This property specifies how flex items are laid out in the flex container, by setting the direction of the flex container’s main axis. They can be laid out in two main directions, like rows horizontally or like columns vertically.
Full article