响应导航列表未显示内容

<nav class="navbar">
  <ul class="nav-list">
    <li class="nav-item"><a href="#home">Home</a></li>
    <li class="nav-item"><a href="#about">About</a></li>
    <li class="nav-item"><a href="#services">Services</a></li>
    <li class="nav-item"><a href="#contact">Contact</a></li>
  </ul>
</nav>

.navbar {
  background-color: #333;
  overflow: hidden;
}

.nav-list {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
}

.nav-item {
  float: left;
}

.nav-item a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 20px;
  text-decoration: none;
}

.nav-item a:hover {
  background-color: #ddd;
  color: black;
}

document.addEventListener('DOMContentLoaded', function() {
  const navToggle = document.querySelector('.nav-toggle');
  const navList = document.querySelector('.nav-list');

  navToggle.addEventListener('click', function() {
    navList.classList.toggle('active');
  });
});

@media screen and (max-width: 600px) {
  .nav-list {
    flex-direction: column;
  }

  .nav-item {
    width: 100%;
  }
}