text: import React, { useEffect } from 'react';
  import Header from './Header';
  
  export default function NotFound() {
    useEffect(() => {
      document.title = 'Help | What to do?';
    }, []);
  
    return (
      <div className="container">
        <Header tagline="404 -  Page not found!" />
        <div className="alert alert-warning">
          <strong>Oops.... sorry!</strong>
          <br />
          <span>The requested page could not be found.</span>
        </div>
      </div>
    );
  }
  