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 top sticky</title>
  <style>
    .bar {
      position: sticky;
      top: 0;
    }
  </style>
</head>
<body>
  <div class="bar">Sticky bar</div>
  <p>Scroll content</p>
  <p>More lines</p>
  <p>Keep going</p>
  <p>End</p>
</body>
</html>

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CSS top Property - sticky 0