text: import React from 'react';
  import { NavLink } from 'react-router-dom';
  
  
  const Header = () => (
      <header>
          <h1>Portfolio</h1>
          <NavLink to="/" activeClassName="is-active" exact ={true} >Home Page</NavLink>
          <NavLink to="/portfolio" activeClassName="is-active" exact ={true} >Portfolio Page</NavLink>
          <NavLink to="/contact" activeClassName="is-active">Contact</NavLink>
      </header>
  );
  
  export default Header;
  