Grokking CSS for Web Development
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Relative Units (rem, em, vw, vh)

A relative unit is a length that the browser calculates from some other size: the font size of the page's root element, the font size of an element, or the size of the browser window. Because the other size can change, a relative length changes with it. This lesson converts the recipe card from the previous lesson to relative units and measures what each unit follows.

rem: relative to the root font size

rem stands for "root em". One rem equals the font size of the <html> element, which is the root of the page

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