/* ADDED: Modal styles */
    #inactivityModal {
      display: none;
      position: fixed;
      z-index: 9999;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.5);
    }

    .modal-content {
      background-color: white;
      margin: 15% auto;
      padding: 30px;
      border: 1px solid #888;
      width: 400px;
      border-radius: 15px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      text-align: center;
    }

    .modal-buttons {
      margin-top: 20px;
      display: flex;
      justify-content: space-around;
    }

    .modal-buttons button {
      padding: 10px 20px;
      font-size: 16px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
    }

    .modal-yes {
      background-color: #007bff;
      color: white;
    }

    .modal-no {
      background-color: #ccc;
      color: black;
    }