Hello,
It is not possible to reach the result by custom CSS
but you may copy xstore/woocommerce/single-product/product-image-builder.php to your child-theme/woocommerce/single-product/product-image-builder.php and change the next line -> https://prnt.sc/Cx6fGbASgt_z or submit your request here – https://www.8theme.com/taskboard/ and wait until your request will become popular among others.
Regards