How to cross out out of stock variants in Brooklyn theme?

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I want to make it more obvious to my clients which variants are sold out. I would like to add like a cross out function to my variants that are sold out. I would think it's just and easy tweak in the code. Can someone help me please? Here's a picture of what I'm looking for. 

WhatsApp Image 2020-08-18 at 3.49.30 PM.jpeg