HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Class selector demo</title>

  <style>

    .intro {

      font-weight: bold;

      color: #7c3aed;

      font-size: 1.75rem;

    }

    .note {

      background: #fef9c3;

      border-left: 4px solid #eab308;

      padding: 0.75rem 1rem;

    }

  </style>

</head>

<body>

  <h1 class="intro">Welcome!</h1>

  <p class="note">Classes let you reuse the same style on many elements.</p>

  <p>This paragraph uses the default browser style.</p>

</body>

</html>

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How to Add CSS to HTML — Class Selector