为什么CSS不显示内容？

Question

我正在创建一个下拉菜单。到目前为止一切都很好，但是我想显示一个悬停的下拉列表。但是我不知道为什么我的CSS无法正常工作。

这是我的代码：

.dropbtn {
  background-color: red;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

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

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

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {
  background-color: #f1f1f1
}

.dropdown:hover {
  display: block;
}

.dropdown:hover .dropbtn {
  background-color: #3e8e41;
}

<div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>

你们能帮我找出我想念的东西吗？ 预先感谢。

Answer 1

只需将类名.dropdown-content添加到CSS中即可。\ 只需替换代码

.dropdown:hover {
  display: block;
}

使用

.dropdown:hover .dropdown-content{
  display: block;
}

Answer 2

在悬停时也显示下拉菜单内容

.dropdown:hover  .dropdown-content {
  display: block;
}

.dropbtn {
  background-color: red;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

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

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

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover  .dropdown-content {
  display: block;
}

.dropdown:hover .dropbtn {
  background-color: #3e8e41;
}

<div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  <div class="dropdown-content">
  <a href="#">Link 1</a>
  <a href="#">Link 2</a>
  <a href="#">Link 3</a>
  </div>
</div>