Jank in CSS transform animation

I’m getting some jank/stutter in my animation in my React App. I have a simple carousel with infinite scroll. But I’m getting the jank when I look at the site on my phone and when I try to use .scss instead of css files. You can see the jank/stutter in the attached codepen. All of the css is in index.scss. HTML and javascript are in App.js. Please let me know if you need any more info, this has been driving me crazy.

https://codesandbox.io/s/codepen-with-react-forked-zq6lly?file=/src/components/App.js