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CSS flex-box layout is a CSS3 web layout model. It is in the W3C's candidate recommendation (CR) stage. The flex layout allows responsive elements within a container to be automatically arranged depending upon screen size (or device).
One of the most defining features of the flex layout is its ability to form-fit, based on its viewing environment. Flex boxes can adjust in size--either decreasing, to avoid unnecessarily monopolizing space, or increasing to make room for contents to be constrained within its boundaries. Moreover, the flex layout is less restrictive in terms of content flow than those, for example, of the block and inline display types, which are generally uni-directional. Indeed, not only can flex directional flow be specified, at the style level, as rightwards, leftwards, upwards, or downwards; individual items within a flex container may also be automatically reordered and rearranged to suit the available layout space.
Following are a few terms associated with the flex layout model
Designating an element as a flex element is relatively easy. All that is necessary is to set the display property to either flex or inline-flex as follows:
By setting the display to one of the two values above, an element becomes a flex container and its children flex items. Setting the display to flex makes the container a block-level element, while setting the display to inline-flex makes the container an inline-level element.
One of flexbox's advantages is the ability to easily align items within the container to the center of a page, both vertically and horizontally.
display: flex; align-items: center; justify-content: center;
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