HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>#id vs .class</title>
  <style>
    body {
      margin: 16px;
      font-family: system-ui, sans-serif;
      color: #0f172a;
    }

    #banner {
      background: #dbeafe;
      padding: 0.75rem;
      margin-bottom: 0.5rem;
      border-radius: 8px;
    }

    .note {
      background: #fef3c7;
      padding: 0.75rem;
      margin-bottom: 0.5rem;
      border-radius: 8px;
    }
  </style>
</head>
<body>
  <div id="banner">#banner (one)</div>
  <div class="note">.note</div>
  <div class="note">.note again</div>
</body>
</html>

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CSS ID Selector — #id vs .class