body {
    background: url('https://example.com/christmas-background.jpg') no-repeat center center fixed;
    background-size: cover;
  }
  
  .card {
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
  }
  
  .btn-primary {
    background-color: #d9534f;
    border-color: #d9534f;
  }
  
  .btn-primary:hover {
    background-color: #c9302c;
    border-color: #ac2925;
  }
  
  #imageContainer img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    cursor: pointer; /* 設置圖片為可點擊 */
  }
  
  .lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
  }
  
  .lightbox-img {
    max-width: 90%;
    max-height: 80%;
  }
  
  .close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 36px;
    color: white;
    cursor: pointer;
    background: none;
    border: none;
  }
  
  .close-btn:hover {
    color: #d9534f;
  }