HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :target Smooth Scroll Example</title>
  <style>
    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      color: #334155;
    }

    nav a {
      margin-right: 0.75rem;
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }

    section {
      min-height: 50vh;
      padding: 1.25rem;
      margin: 1rem 0;
      background: #f8fafc;
      border-radius: 0.5rem;
      scroll-margin-top: 1rem;
    }

    section:target {
      outline: 2px solid #93c5fd;
      outline-offset: 4px;
    }

    section:target h2 {
      color: #2563eb;
    }
  </style>
</head>
<body>
  <nav>
    <a href="#about">About</a>
    <a href="#features">Features</a>
    <a href="#contact">Contact</a>
  </nav>

  <section id="about">
    <h2>About</h2>
    <p>Scroll smoothly to each section and see :target styles apply.</p>
  </section>

  <section id="features">
    <h2>Features</h2>
    <p>The targeted heading turns blue with a light outline.</p>
  </section>

  <section id="contact">
    <h2>Contact</h2>
    <p>Click the nav links above to try smooth scrolling.</p>
  </section>
</body>
</html>

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CSS :target Selector - Smooth Scroll