HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>bottom with position fixed</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
      min-height: 120vh;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #0f172a;
      color: #fff;
      padding: 12px;
      text-align: center;
    }
  </style>
</head>
<body>
  <p><strong>position: fixed</strong> plus <strong>bottom: 0</strong> pins the bar to the viewport bottom. Scroll to see it stay.</p>
  <p>Page content continues below so you can scroll.</p>
  <div class="bar">Fixed to bottom</div>
</body>
</html>

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CSS bottom Property — fixed