从Kebab到X的CSS导航栏过渡

/* 示例代码 */
nav {
  display: flex;
  justify-content: space-around;
  background-color: #333;
}

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

/* 示例代码 */
nav a {
  color: white;
  text-decoration: none;
  padding: 14px 20px;
}

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

<!-- 示例代码 -->
<nav>
  <ul>
    <li><a href="#">Home</a></li>
    <li class="dropdown">
      <a href="#" class="dropbtn">Dropdown</a>
      <div class="dropdown-content">
        <a href="#">Link 1</a>
        <a href="#">Link 2</a>
        <a href="#">Link 3</a>
      </div>
    </li>
  </ul>
</nav>

<style>
/* CSS */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown:hover .dropdown-content {
  display: block;
}
</style>