html - 导航栏中的CSS下拉按钮

好的，我尝试学习CSS，并尝试在导航栏中插入一个下拉按钮。

发生的是，当我将鼠标悬停在按钮上时，整个导航栏都在扩展，而不仅仅是按钮的内容在扩展。我究竟做错了什么？谢谢！

ul {
  list-style-type: none;
  margin-left:8%;
  margin-right: 8%;
  padding-left: 0;
  padding-right: 0;
  overflow: hidden;
  background-color: #f3f3f3;
}

.right{
  float: right;
}


li a {
  float: left;
  display: block;
  color: #6f6f6f;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #e0e0e0;
}

p {
  color: red;
  margin-left: 8%;
  margin-right: 8%;
}

body{
  font-family:Arial;
  background-color:#f9f9f9;
}

.dropbtn {
  background-color: #f3f3f3;
  color: #6f6f6f;
  padding: 14px 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
  position: relative;
  display: block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  right: 0;
  display: none;
  position: relative;
  background-color: #f9f9f9;
  min-width: 10px;
}

/* Links inside the dropdown */
.dropdown-content a {
  right: 0;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #e0e0e0}

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
  display: block;
  right:0;
}

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn {
  background-color: #e0e0e0;
}

<ul>
  <li><a href="/"><img src="../../static/image/logoRect.png" width="25"> </a></li>
  <li><a href="/movies">Movies</a></li>
  <li><a class="right" href="">Search</a></li>
  <div class="right">
    <div class="dropdown">
      <button class="dropbtn">Dropdown</button>
      <div class="dropdown-content">
        <a href="#">Links 1</a>
        <a href="#">Link 2</a>
        <a href="#">Link 3</a>
      </div>
    </div>
  </div>
  <li><a class="right" href="#about">Explore</a></li>
</ul>

最佳答案

您必须指定高度并消除隐藏的溢出。

ul {
list-style-type: none;
margin-left:8%;
margin-right: 8%;
padding-left: 0;
padding-right: 0;
// overflow: hidden;  <---remove
height: 48px;         // <---add
background-color: #f3f3f3;
}

如果没有，则ul默认为：

height: auto;