HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS #id Basic Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      color: #475569;
    }

    #main-title {
      font-size: 2rem;
      color: #1e3a8a;
      text-align: center;
      margin-bottom: 1rem;
    }

    #highlight {
      background-color: #fef9c3;
      font-weight: 700;
      padding: 0.5rem 0.65rem;
      border-radius: 0.35rem;
      border-left: 3px solid #eab308;
    }
  </style>
</head>
<body>
  <h1 id="main-title">Welcome to My Blog</h1>
  <p>This is a paragraph about the blog.</p>
  <p id="highlight">This paragraph is uniquely styled.</p>
</body>
</html>

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CSS #id Selector - Title and Highlight