Distinct Icons to the left of each pop-up block on Product Information

[seatcraft]

Hello, I have added Pop-up Blocks to the Product Information sections of each product. I want to add Icons to the left of it that are already included in Shopify. For example, I want to add the ruler to Dimensions, the clipboard to Specs, etc. I have added code that adds the below icons; this is based on a question asked by the community.

Is there a way to do this? 

Thank you in advance.