Grey out product image in collection when out of stock

Hi all, i’m using sense 2.0 as theme

I’m looking for a way to grey out, change the opacity or something like that, in collection page when a product it’s out of stock.

www.danicoffeeshop.com

none of the method i’ve tried so far was working

@stefanensko - sold out products do not have any custom css class, so need to edit code and make sure that sold out product has unique class to set css to it

Any solution on how to do it please?

@stefanensko - it will need code editing