react/src/components/nav/nav.js

import {Component} from 'react';

class Nav extends Component {
    render() {
        return  <nav class="header__nav"> 
                    <ul>
                        <li class="header__link login"><a href="#">LOG IN</a></li>
                        <li class="header__link sign"><a href="#">SIGN UP</a></li>
                    </ul> 
                    <div class="hamburger">
                        <span></span>
                        <span></span>
                        <span></span>
                    </div>   
                </nav> 
        }   
}

export default Nav;