.popup {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background-color: #f8f8f8;
      padding: 10px;
      text-align: center;
      z-index: 9999;
    }

    .popup p {
      margin: 0;
      padding: 10px;
    }

    .popup button {
      background-color: #4CAF50;
      color: white;
      padding: 10px 20px;
      border: none;
      cursor: pointer;
    }