Почему данный код не показывает Navbar?

Navbar.js:

function Navbar() {

    const [click, setClick] = useState(false);
    const [button, setButton] = useState(true);


    const handleClick = () => setClick(!click);
    const closeMobileMenu = () => setClick(false);


    const showButton = () => {
        if (window.innerWidth <= 960) {
          setButton(false);
        } else {
          setButton(true);
        }
     };

     window.addEventListener('resize', showButton);


    return (
        <>
            <nav className="navbar"></nav>
            <div className="navbar-container">
                <Link to="/" className="navbar-logo">
                    TRVL <i className="fab fa-typo3"></i>
                </Link>
                <div className='menu-icon' onClick={handleClick}>
                    <i className={click ? 'fas fa-times' : 'fas fa-bars'} />
                </div>
                <ul className={click ? 'nav-menu active' : 'nav-menu'}>
                    <li className="nav-item">
                        <Link to='/' className='nav-links' onClick={closeMobileMenu}>
                            Home
                        </Link>
                    </li>
                    <li className="nav-item">
                        <Link to='/services' className='nav-links' onClick={closeMobileMenu}>
                            Services
                        </Link>
                    </li>
                    <li className="nav-item">
                        <Link to='/products' className='nav-links' onClick={closeMobileMenu}>
                            Products
                        </Link>
                    </li>
                    <li className="nav-item">
                        <Link to='/sign-up' className='nav-links-mobile' onClick={closeMobileMenu}>
                            Sign Up
                        </Link>
                    </li>
                </ul>
                {button && <Button buttonStyle='btn--outline'>SIGN UP</Button>}
            </div>
        </>
    )
}

export default Navbar

Navbar.css:

.navbar {
    background: linear-gradient(90deg, rgb(28, 27, 27) 0%, rgb(26, 23, 23) 100%);
    height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.2rem;
  position: sticky;
  top: 0;
  z-index: 999;
 }
 
 .navbar-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80px;
    max-width: 1500px;
 }

 .navbar-logo {
    color: #fff;
    justify-self: start;
    margin-left: 20px;
    cursor: pointer;
    text-decoration: none;
    font-size: 2rem;
    display: flex;
    align-items: center;
 }

 .fa-typo3 {
    margin-left: 0.5rem;
    font-size: 1.8rem;
 }

 .nav-menu {
    display: grid;
    grid-template-columns: repeat(4, auto);
    grid-gap: 10px;
    list-style: none;
    text-align: center;
    width: 60vw;
    justify-content: end;
    margin-right: 2rem;
 }

 .nav-item {
    height: 80px;
 }

 .nav-links {
    color: #fff;
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 0.5rem 1rem;
    height: 100%;
 }

 .nav-links:hover {
    border-bottom: 4px solid #fff;
    transition: all 0.2s ease-out;
 }

 .fa-bars {
    color: #fff;
 }

 .nav-links-mobile {
    display: none;
 }

 .menu-icon {
    display: none;
 }


 @media screen and (max-width: 960px) {
    .NavbarItems {
      position: relative;
    }
 
    .nav-menu {
      display: flex;
      flex-direction: column;
      width: 100%;
      height: 90vh;
      position: absolute;
      top: 80px;
      left: -100%;
      opacity: 1;
      transition: all 0.5s ease;
    }
 
    .nav-menu.active {
      background: #242222;
      left: 0;
      opacity: 1;
      transition: all 0.5s ease;
      z-index: 1;
    }
 
    .nav-links {
      text-align: center;
      padding: 2rem;
      width: 100%;
      display: table;
    }
 
    .nav-links:hover {
      background-color: #fff;
      color: #242424;
      border-radius: 0;
    }
 
    .navbar-logo {
      position: absolute;
      top: 0;
      left: 0;
      transform: translate(25%, 50%);
    }
 
    .menu-icon {
      display: block;
      position: absolute;
      top: 0;
      right: 0;
      transform: translate(-100%, 60%);
      font-size: 1.8rem;
      cursor: pointer;
    }
 
    .fa-times {
      color: #fff;
      font-size: 2rem;
    }
 
    .nav-links-mobile {
      display: block;
      text-align: center;
      margin: 2rem auto;
      border-radius: 4px;
      width: 80%;
      text-decoration: none;
      font-size: 1.5rem;
      background-color: transparent;
      color: #fff;
      padding: 14px 20px;
      border: 1px solid #fff;
      transition: all 0.3s ease-out;
    }
 
    .nav-links-mobile:hover {
      background: #fff;
      color: #242424;
      transition: 250ms;
    }
 }

должно быть как на фотографии