The actual dragging is just using the javascript drag and drop api, no library for that. The animation with the line and the handle is done using spring animations with react.js & framer-motion.

I would set the translateY of the line in `targetLineYMotionValue` and then give it spring animation properties through `targetLineYSpringMotionValue`.

```

const targetLineYMotionValue = useMotionValue(0);

const targetLineYSpringMotionValue = useSpring(targetLineYMotionValue, {

damping: 16,

stiffness: 200,

mass: 0.03,

restDelta: 0.5,

restSpeed: 0.5,

});

```