body {
      font-family: Arial, sans-serif;
      text-align: center;
      padding: 50px;
      background-color: #f0f0f0;
    }

    .thumbnail {
      width: 200px;
      cursor: pointer;
      border: 2px solid #ccc;
      transition: 0.3s;
    }

    .thumbnail:hover {
      border-color: #333;
    }

    /* Modal styles */
    .modal {
      display: none; /* Hidden by default */
      position: fixed;
      z-index: 999;
      left: 0;
      top: 0;
      overflow: auto;
      background-color: rgba(0, 0, 0, 0.8);
    }

    .modal-content {
      margin: 5% auto;
      display: block;
      max-width: 80%;
      max-height: 80%;
      box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    }

    .close {
      position: absolute;
      top: 30px;
      right: 50px;
      color: white;
      font-size: 35px;
      font-weight: bold;
      cursor: pointer;
    }

    .close:hover {
      color: #ccc;
    }