HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>#id basic</title>
  <style>
    body {
      margin: 16px;
      font-family: system-ui, sans-serif;
      color: #0f172a;
      line-height: 1.5;
    }

    #blue {
      background-color: skyblue;
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
    }
  </style>
</head>
<body>
  <p id="blue">This paragraph has id="blue".</p>
  <p>This is a regular paragraph.</p>
</body>
</html>

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CSS ID Selector — basic #id