.preview-img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 15px;
  }
  #spinner {
    display: none;
    text-align: center;
    margin: 20px 0;
  }
  #downloadAll, #downloadZip {
    display: none;
  }