HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:root with var()</title>
  <style>
    :root {
      --main-color: hotpink;
    }

    h1 {
      color: var(--main-color);
    }

    p {
      border-left: 4px solid var(--main-color);
      padding-left: 8px;
    }
  </style>
</head>
<body>
  <h1>Title</h1>
  <p>Both use the same root token.</p>
</body>
</html>

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CSS :root — var() reuse