PrestaShop expert slight default theme modification

I'm looking for a PrestaShop expert to change the thumb-list product images on the quick view from vertical to horizontal orientation as on the product page on the "default PrestaShop theme". Preferably the default "assets/js/[login to view URL]" would be intact and if possible use [login to view URL] file. All changes to the code should be documented in external text file so if needed to self re-apply changes manually in future PrestaShop updates.