🔸rem

╱🚧 under construction -> :root, <html>, document.documentElement

CSS ⟩ values ⟩ relative ⟩ units ⟩ rem

rem = <html> 的 font-size

⭐ rem 是 “root em” 的縮寫，r 指 :root (<html>)。

/* :root = html */
:root { font-size: 16px; }  /* ⭐️ 定義 rem = 16px */

h1 { font-size: 2rem; }     /* 2rem = 32px */
p  { font-size: 1rem; }     /* 1rem = 16px */
Previouspercentage (％)Nextem

Last updated

Was this helpful?