Debutify theme - Reduce collection list white borders and make the images square

[gdcg]

Hi,

I want to make the collection list pictures on my home page a rectangle shape and reduce the white borders on mobile phone. I'm using the Debutify theme. 

Here is my URL - https://banbba.com/

Here are the reference images of what I have (BANBBA) and what I want (BERSHKA) 

Thanks,

Greg