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All animations MUST be driven by the useCurrentFrame() hook.
Write animations in seconds and multiply them by the fps value from useVideoConfig(). 
import { useCurrentFrame } from "remotion";

export const FadeIn = () => {
  const frame = useCurrentFrame();
  const { fps } = useVideoConfig();

  const opacity = interpolate(frame, [0, 2 * fps], [0, 1], {
    extrapolateRight: 'clamp',
  });
 
  return (
    <div style={{ opacity }}>Hello World!</div>
  );
};
CSS transitions or animations are FORBIDDEN - they will not render correctly.
Tailwind animation class names are FORBIDDEN - they will not render correctly.