body {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      font-family: 'Segoe UI', sans-serif;
      background-color: rgba(70, 69, 69, 0.7);
    }

    .card {
      background-color: rgba(255, 255, 255, 0.8);
      padding: 30px;
      border-radius: 16px;
      box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
      width: 90%;
      max-width: 400px;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .card button {
      font-size: 18px;
    }

    footer {
      position: absolute;
      bottom: 10px;
      font-size: 14px;
      color: #888;
    }