How can I add customer reviews to my cart slider? [Impulse theme]

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Hey! I've seen some sites that have customized their cart slider to show some customer reviews and would like to implement the same in my store. I looked around the Shopify app store to find a free app that could customize the cart slider and managed to find one that I liked.

Unfortunately, it doesn't have the option to add reviews to the cart page but luckily it has a section where it says "additional CSS" so maybe there's still some hope ^^

Would really appreciate it if someone could help me out or guide me to the right direction.
Store URL: Twinkledekor.myshopify.com