Product listing in collection page by an App without disturbing shops' theme

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I'm working on a Shopify public app development. The app is expected to take control of the product listing when the collection is being clicked. I have a Javascript when the is clicked, the products are fetched from the API. To display those products I need to retain the shops' original theme (CSS styling). Each shop will have its own theme. How to display the products without disturbing the theme?

Note: I don't prefer changing liquid files