frontend/src/components/Header.js

import React from 'react';
import logo from '../logo.png';
import '../styleSheets/style.css'

class Header extends React.Component {
  render() {
    const Logo = () => {
      return (
        <nav>
          <img className="site-logo" src={logo} alt="logo 858 "/>
        </nav>
      );
    }
    return (
      <header>
        <section className="container">
          <Logo/>
        </section>
      </header>
    )
  }
}

export default (Header);