HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS opacity Hover Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    .btn {
      padding: 0.75rem 1.25rem;
      border: none;
      border-radius: 0.5rem;
      background: #2563eb;
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      opacity: 1;
      transition: opacity 0.3s ease;
    }
    .btn:hover {
      opacity: 0.7;
    }
  </style>
</head>
<body>
  <h1>Button with Hover Opacity</h1>
  <button class="btn" type="button">Hover me</button>
</body>
</html>

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CSS opacity Property - Hover Fade