HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS scroll-behavior Example</title>
  <style>
    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: system-ui, sans-serif;
      margin: 0;
    }

    nav {
      position: sticky;
      top: 0;
      display: flex;
      gap: 16px;
      padding: 14px 20px;
      background: #0f172a;
      z-index: 1;
    }

    nav a {
      color: #fff;
      text-decoration: none;
      font-weight: 600;
    }

    section {
      height: 100vh;
      padding: 24px;
      display: grid;
      place-items: center;
      font-size: 2rem;
      font-weight: 700;
      color: #0f172a;
    }
  </style>
</head>
<body>
  <h1 style="padding:20px;margin:0;">Smooth Scrolling Example</h1>
  <nav>
    <a href="#section1">Section 1</a>
    <a href="#section2">Section 2</a>
    <a href="#section3">Section 3</a>
  </nav>
  <section id="section1" style="background:#fecaca;">Section 1</section>
  <section id="section2" style="background:#bfdbfe;">Section 2</section>
  <section id="section3" style="background:#bbf7d0;">Section 3</section>
</body>
</html>

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Smooth scrolling with anchor links