Nice tool!
Two small UI suggestions: 1. Add dark-mode styling to the scrollbar so it matches the rest of the interface. 2. Consider adding a Tutorial button that opens a short walkthrough. A few slides with text, or a small GIF with an explanation, would make the site easier to understand for first-time users. Keep in mind that many users will linger on the website only for a couple of seconds and don't have much patience. It's important to show fast how the website works.