Adding 'Sticky Add To Cart' to Dawn 2.0 Theme: I Need Help!

Hello everyone, I found a feature on a website that uses the ConvertX theme, and I discovered it’s called “Sticky Add To Cart.” However, the way it functions, I couldn’t find anything similar in any Shopify apps. I’d like to implement this feature on my site, but here’s the catch: I’m using the Dawn 2.0 theme.

To assist you in comprehending its functionality, here is the product page of a site featuring this capability:

https://jjoutlet.com.br/collections/bebes-e-criancas/products/trem-divertido-empilha-domino-com-som

I have the theme on my computer, and if necessary, I can provide a link for you to analyze it thoroughly to see if you can better understand its operation. This way, you can help me with the implementation.

Dawn theme does not have exactly the same feature, but you can select Cart type is Popup notification to have similar in your Online store > Themes > Customize > Theme settings > Cart

Add sticky add to cart in your store: