Motion Canvas

Motion Canvas

<Rect size={200} radius={100} />

or a <Spline>:

<Spline
	points={[
		[0, -150],
		[150, 0],
		[0, 150],
		[-150, 0],
	]}
	smoothness={0.6} // Necessary for some reason.
	lineJoin={'round'}
	closed
/>