function App() {
  React.useEffect(() => {
    const els = document.querySelectorAll(".reveal");
    const io = new IntersectionObserver(
      (entries) => {
        entries.forEach((e) => {
          if (e.isIntersecting) {
            e.target.classList.add("in");
            io.unobserve(e.target);
          }
        });
      },
      { threshold: 0.12 }
    );
    els.forEach((el) => io.observe(el));
    return () => io.disconnect();
  }, []);

  return (
    <>
      <Hero />
      <About />
      <Cause />
      <Footer />
    </>
  );
}

ReactDOM.createRoot(document.getElementById("app")).render(<App />);