HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :target TOC Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      color: #334155;
      max-width: 32rem;
    }

    .toc {
      display: flex;
      flex-direction: column;
      gap: 0.35rem;
      margin-bottom: 1.25rem;
    }

    .toc a {
      color: #2563eb;
      text-decoration: none;
      font-size: 0.9rem;
    }

    .chapter {
      padding: 1rem;
      margin-bottom: 0.75rem;
      background: #f8fafc;
      border-radius: 0.5rem;
      scroll-margin-top: 1rem;
    }

    .chapter:target {
      background: #eff6ff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    }

    .chapter h2 {
      margin: 0 0 0.35rem;
      font-size: 1.1rem;
    }

    .chapter p {
      margin: 0;
      font-size: 0.875rem;
      color: #64748b;
    }
  </style>
</head>
<body>
  <nav class="toc">
    <a href="#chapter-1">Chapter 1: Intro</a>
    <a href="#chapter-2">Chapter 2: Selectors</a>
    <a href="#chapter-3">Chapter 3: Properties</a>
  </nav>

  <section id="chapter-1" class="chapter">
    <h2>Chapter 1</h2>
    <p>Getting started with CSS basics.</p>
  </section>

  <section id="chapter-2" class="chapter">
    <h2>Chapter 2</h2>
    <p>Learn how selectors target HTML elements.</p>
  </section>

  <section id="chapter-3" class="chapter">
    <h2>Chapter 3</h2>
    <p>Explore color, font, and layout properties.</p>
  </section>
</body>
</html>

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CSS :target Selector - Table of Contents