HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS opacity Fade In Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }
    .card {
      width: 280px;
      padding: 1.25rem;
      border-radius: 0.75rem;
      background: #ecfdf5;
      border: 1px solid #bbf7d0;
      color: #166534;
      font-weight: 600;
      animation: fadeIn 1s ease forwards;
    }
  </style>
</head>
<body>
  <h1>Card Fading In</h1>
  <div class="card">This card fades in using opacity animation.</div>
</body>
</html>

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CSS opacity Property - Fade In Animation