.vertical-product-gallery-slider {
    display: flex;
  }
  
  .thumbnails {
    list-style: none;
    margin: 0;
    padding: 0;
  }
  
  .thumbnails li {
    margin-bottom: 10px;
  }
  
  .main-image {
    flex: 1;
  }
  
  .main-image img {
    max-width: 100%;
  }