navbar

<nav className="navbar navbar-expand-lg navbar-light bg-light">
            <Link className="navbar-brand" to="/">MERN JWT Auth</Link>
            <button className="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav"
                    aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
                <span className="navbar-toggler-icon"></span>
            </button>
            <div className="ml-auto collapse navbar-collapse" id="navbarNav">
                <ul className="navbar-nav">
                    <li className="nav-item active">
                        <Link className="nav-link" to="/">Home <span className="sr-only">(current)</span></Link>
                    </li>
                    <li className="nav-item">
                        <Link className="nav-link" to="/about">About</Link>
                    </li>
                    <li className="nav-item">
                        <Link className="nav-link" to="/login">Login</Link>
                    </li>
                    <li className="nav-item">
                        <Link className="nav-link" to="/register">Register</Link>
                    </li>
                </ul>
            </div>
        </nav>