body {
      font-family: Arial, sans-serif;
    }

    /* Popup background */
    .popup-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      justify-content: center;
      align-items: center;
      z-index: 999;
    }

    /* Popup box */
    .popup {
      background: white;
      padding: 25px;
      border-radius: 10px;
      text-align: center;
      width: 850px;
      box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    }

    .popup button {
      margin-top: 15px;
      padding: 10px 20px;
      border: none;
      background: #007bff;
      color: white;
      border-radius: 5px;
      cursor: pointer;
    }

    .popup button:hover {
      background: #0056b3;
    }
  </style>