Flexbox is a fairly new CSS3 layout standard that allows you to have layout elements automatically fit the available space according to layout rules defined in a website's stylesheet. While as of today still a W3C Candidate Recommendation Flexbox is already well-supported by all major browsers. In contrast to tried and true block- or grid-based layouts with Flexbox the onus of defining the exact placement of an element isn't on the designer but the browser. Flexbox therefore is much more, well, flexible ...
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