HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>right with position: fixed</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 24px;
      background: #f8fafc;
      min-height: 120vh;
      margin: 0;
    }

    .rgt-fab {
      position: fixed;
      right: 20px;
      bottom: 20px;
      width: 56px;
      height: 56px;
      border: none;
      border-radius: 999px;
      background: #2563eb;
      color: #fff;
      font-size: 28px;
      line-height: 1;
      cursor: pointer;
      box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
    }

    .rgt-spacer {
      margin-top: 24px;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>Fixed action button</h1>
  <p class="rgt-spacer">Scroll the page — the button stays 20px from the right and bottom of the viewport.</p>
  <button class="rgt-fab" type="button" title="Add" aria-label="Add">+</button>
</body>
</html>

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Fixed corner button with right and bottom offsets