HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS :root Basic Example</title>

  <style>

    :root {

      --primary-color: #2563eb;

      --secondary-color: #16a34a;

      --font-size: 1rem;

    }



    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

      font-size: var(--font-size);

      color: var(--primary-color);

    }



    h1 {

      color: var(--secondary-color);

      font-size: 1.5rem;

    }

  </style>

</head>

<body>

  <h1>Hello World</h1>

  <p>This page uses CSS variables defined on :root.</p>

</body>

</html>

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CSS :root Selector - Basic Variables