how to add html in useState
export default function navbar() {
    const [isOpen, setIsOpen] = useState(false);
    const handleClick = () => {
      setIsOpen(!isOpen)
    }
    return (
      <nav>
        <div className="logoBtn">
          <div className="logo">
            <a href="#"><h1>Logo</h1></a>
          </div>
          <div className="btn" onClick={handleClick}>
            <div className="bar"></div>
            <div className="bar"></div>
            <div className="bar"></div>
          </div>
        </div>
        <ul className={isOpen ? 'showNav' : und}>
          <li><a href="#">Home</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Projects</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
      </nav>
    );
  }
