How to show null results

Hi All, 

I'm a relative new user to PowerBI. I currently work in sales and am looking to transfer reporting to BI. I have a table here that shows how much of a particular product a customer has purcahses and where they haven't purchased the product. Ideally, I want it to just show when the customer hasn't purchased a product (just the red squares boxes not the greenboxs). I'm a little lost on how to show this. 

Any help would be much appeciated.