Use :root for Flexible Type

/* The type font size in a responsive layout should be able to adjust with each viewport. You can calculate the font size based on the viewport height and width using :root: */ :root { font-size: calc(1vw + 1vh + .5vmin); } /* Now you can utilize the root em unit based on the value calculated by :root: */ body { font: 1em/1.6 sans-serif; }

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You can use [html][/html], [css][/css], [php][/php] and more to embed the code. Urls are automatically hyperlinked. Line breaks and paragraphs are automatically generated.