How can I make my HTML/CSS/JS Chatbot follow the scroll?

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Hello, I developed a Chatbot using HTML, CSS, and JS in VSC. It fully works and I implanted all the code into our shopify code. I'm facing a problem that I did not account for however. Originally, it was planted in the bottom-right of the screen, but now it's planted at the complete bottom right of the website. I want it to follow in the bottom right as I scroll, but I can't seem to figure that out. Anyone have a solution? Thanks!