Thumbnail Product Images - Need to change from vertical to horizontal

Site URL: https://www.bigpalouka.com/all-prints

Hi there, I am needing to change the thumbnails on my Store Page from vertical to horizontal orientation. What code can I inject to achieve this? I have injected some code to get the images to contain within 'object-fit' but there are still large empty white spaces above and below the thumbnails.

See below for the current code inserted into the header.

<style>
  
  .ProductItem-gallery-slides-item-image {
  
    object-fit : contain !important;
    }
  
  .grid-item-image {
  
    object-fit : contain !important;
    
    }
  
  </style>

I figured it out, I had to go into the All Prints page, into that specific page and select the pencil icon to change the image aspect ratio.