How can I adjust the height of slideshow images on a product page?

[NashMashPets]

Slideshow at top of product page height is too large. is there a way.. to edit the height of the transparent slideshow images on the product page-not home page slideshow.

my page link: 

https://nashmashpets.com/products/automatic-explore-retractable-dog-leash-pet-traction-rope-5m-dog-r...