Change format displayed for mobile collection pictures to Portrait 2:1 (Stilleto Theme)

[Adrian92]

Hello,

Right now im using Square 1:1. But on mobile version it looks wierd, its to much space between the pictures and the text.

I would like to change the format displayed only on mobile devices for the collection products to Portrait 2:1 can I add some code or how can i do it?

Please help, thank you. 

I've attached two pictures with diferent sizes for mobile.

www.PandoraNarghileaShop.com