React Js Scroll to Top of Page

<!DOCTYPE html>
<html>

</head>

<body>
  <div id="app" style="height:10000px"></div>
  <script type="text/babel">
    const { useState, useEffect } = React;

function App() {
      const [visible, setVisible] = useState(false);

const scrollToTop = () => {
        window.scrollTo({
          top: 0,
          behavior: 'smooth'
        });
      };

useEffect(() => {
        window.addEventListener('scroll', toggleVisible);
        return () => {
          window.removeEventListener('scroll', toggleVisible);
        };
      }, []);

return (
        <>
          <h3>React Js Scroll to Top of Page</h3>
          <button
            className="scroll-to-top-button"
            onClick={scrollToTop}
            style={{ display: visible ? 'inline' : 'none' }}
          >
            <i class="fa-solid fa-circle-up"></i>
          </button>
        </>
      );
    }

ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .scroll-to-top-button {
      display: none;
      position: fixed;
      bottom: 20px;
      right: 30px;
      z-index: 99;
      font-size: 18px;
      border: none;
      outline: none;
      background-color: #555;
      color: white;
      cursor: pointer;
      padding: 10px;
      border-radius: 8px;
    }

.scroll-to-top-button:hover {
      background-color: #777;
    }
  </style>

</body>

</html>

 
<!DOCTYPE html>
<html>
​
<head>
  <meta charset="UTF-8">
  <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css"
    integrity="sha512-z3gLpd7yknf1YoNbCzqRKc4qyor8gaKU1qmn+CShxbuBusANI9QpRohGBreCFkKxLhei6S9CQXFEbbKuqLg0DA=="
    crossorigin="anonymous" referrerpolicy="no-referrer" />
​
</head>
​
<body>
  <div id="app" style="height:10000px"></div>
  <script type="text/babel">
    const { useState, useEffect } = React;
​
    function App() {
      const [visible, setVisible] = useState(false);
​
      const toggleVisible = () => {
        const scrolled = document.documentElement.scrollTop;
        if (scrolled > 300) {
          setVisible(true);
        } else if (scrolled <= 300) {
          setVisible(false);
        }
      };
​
      const scrollToTop = () => {
        window.scrollTo({
          top: 0,
          behavior: 'smooth'
        });
      };
​
      useEffect(() => {
        window.addEventListener('scroll', toggleVisible);
        return () => {
          window.removeEventListener('scroll', toggleVisible);
        };
      }, []);
​
      return (
        <>
          <h3>React Js Scroll to Top of Page</h3>
          <button
            className="scroll-to-top-button"
            onClick={scrollToTop}
            style={{ display: visible ? 'inline' : 'none' }}
          >
            <i class="fa-solid fa-circle-up"></i>
          </button>
        </>
      );
    }
​
    ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .scroll-to-top-button {
      display: none;
      position: fixed;
      bottom: 20px;
      right: 30px;
      z-index: 99;
      font-size: 18px;
      border: none;
      outline: none;
      background-color: #555;
      color: white;
      cursor: pointer;
      padding: 10px;
      border-radius: 8px;
    }
​
    .scroll-to-top-button:hover {
      background-color: #777;
    }
  </style>
​
</body>
​
</html>