get a scroll to top button after scroll in react code example

Example: how to create scroll to top button in reactjs example code

import React from "react";import ScrollUpButton from "react-scroll-up-button"; //Add this line Here export default class Index extends React.Component {    render() {        return (            <div>                <ScrollUpButton />                //This is all you need to get the default view working            </div>        );    }}