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並前往https://www.reddit.com/r/Frontend/comments/sn2yns/when_to_use_rem_em_vwvh_px/

When to use Rem, Em, VW/VH, %, PX? : r/Frontend - Reddit

px is the only absolute unit that never changes. The rest of the units are dependent on some other 'variable'. font size in the case of rem, em.

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