html - 当您尝试选择选项时，CSS 下拉菜单消失

Question

一直在尝试做一个下拉菜单；问题是，当试图将鼠标悬停在菜单选项上时，下拉选项会消失 - 但只是有时! (其他时候，没关系!)

代码:

body {
  margin: 0;
}

.container {
  overflow: hidden;
  background-color: rgb(0, 0, 0);
  font-family: Arial;
  height: 60px;
  vertical-align: middle;
}

.container a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 10px 10px;
  text-decoration: none;
  height: 20px;
  vertical-align: middle;
}

.dropdown {
  float: left;
  overflow: hidden;
}

span {
  vertical-align: middle;
}

.dropdown .dropbtn {
  font-size: 20px;
  border: none;
  outline: none;
  color: white;
  padding: 20px 20px;
  background-color: inherit;
}

.redhover a:hover,
.dropdown:hover .dropbtn {
  background-color: red;
}

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

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

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

<div class="container">
  <a href="index.html"><img src="homeicon.jpg" width="50" alt="Home"></a>
  <div class="redhover">
    <div class="dropdown">
      <button class="dropbtn">GCSEs</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Chemistry</a>
        <a href="biology.html">Biology</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">A-Levels</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Chemistry</a>
        <a href="biology.html">Biology</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">University</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Telecommunications</a>
        <a href="biology.html">Electronic Engineering</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">More</button>
      <div class="dropdown-content">
        <a href="biology.html">About me</a>
        <a href="https://www.youtube.com/channel/UC5GPvJSUO4599z_ugFuoJwg">Youtube</a>
      </div>
    </div>
  </div>
</div>

有什么想法吗？

非常感谢，瑞安

Answer 1

将 .dropdown .dropbtn 改为 padding: 18px 20px 19px 20px;因为填充大于您的下拉菜单，您将退出悬停区域并且下拉菜单将关闭。请参阅具有较小填充的下拉列表示例，这样您就不会退出悬停区域

body {
  margin: 0;
}

.container {
  overflow: hidden;
  background-color: rgb(0, 0, 0);
  font-family: Arial;
  height: 60px;
  vertical-align: middle;
}

.container a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 10px 10px;
  text-decoration: none;
  height: 20px;
  vertical-align: middle;
}

.dropdown {
  float: left;
  overflow: hidden;
}

span {
  vertical-align: middle;
}

.dropdown .dropbtn {
  font-size: 20px;
  border: none;
  outline: none;
  color: white;
  padding: 18px 20px 19px 20px;
  background-color: inherit;
}

.redhover a:hover,
.dropdown:hover .dropbtn {
  background-color: red;
}

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

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

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

<div class="container">
  <a href="index.html"><img src="homeicon.jpg" width="50" alt="Home"></a>
  <div class="redhover">
    <div class="dropdown">
      <button class="dropbtn">GCSEs</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Chemistry</a>
        <a href="biology.html">Biology</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">A-Levels</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Chemistry</a>
        <a href="biology.html">Biology</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">University</button>
      <div class="dropdown-content">
        <a href="chemistry.html">Telecommunications</a>
        <a href="biology.html">Electronic Engineering</a>
      </div>
    </div>
    <div class="dropdown">
      <button class="dropbtn">More</button>
      <div class="dropdown-content">
        <a href="biology.html">About me</a>
        <a href="https://www.youtube.com/channel/UC5GPvJSUO4599z_ugFuoJwg">Youtube</a>
      </div>
    </div>
  </div>
</div>