在css中设计悬停滑块下拉菜单

<ul class="dropdown-menu">
  <li><a href="#">菜单项1</a></li>
  <li><a href="#">菜单项2</a></li>
  <li><a href="#">菜单项3</a></li>
</ul>

.dropdown-menu {
  position: relative;
  display: inline-block;
}

.dropdown-menu li {
  display: none;
}

.dropdown-menu li a {
  display: block;
  padding: 10px;
  text-decoration: none;
  color: #333;
}

.dropdown-menu:hover li {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #fff;
  border: 1px solid #ccc;
}