CSS 菜单悬停不适用于所有项目

如何解决CSS 菜单悬停不适用于所有项目

下面的示例应该在 CSS main-nav 中使用鼠标悬停，这样当鼠标指向菜单项时，项目就会在菜单项周围形成一个块。不知何故，这只适用于右侧的 ABOUT，而不适用于主导航中的其他菜单项。有什么遗漏吗？这可能是孩子父母的问题吗？

HTML index.html

<!DOCTYPE html>

<head>
<title>TITLE</title>
<link href="style.css" rel="stylesheet" type="text/css">
</head>

<body>
<header>
    <div class="row">
    <div class="logo">
        <img src="logo1.png">
    </div>
    <ul class="main-nav">
        <li class="active"><a href=""> HOME </a></li>
        <li><a href=""> DOCUMENTS </a></li>
        <li><a href=""> LOGIN </a></li>
        <li><a href=""> ABOUT </a></li>
    </ul>
</div>
<div class="hero">
    <h1>Welcome</h1>
    <div class="button">
        <a href="" class="btn btn-one"> Watch Video </a>
        <a href="" class="btn btn-two"> Explore More </a>
    </div>
</div>
</header>
</body>
</html>

CSS style.css

{
    margin: 0;
    padding: 0;
}

header
{
    background-image: linear-gradient(rgba(0,0.05),rgba(0,0.05)),url(pic1.jpg);
    height: 100vh;
    background-size: cover;
    background-position: center;
}

.main-nav
{
    float: right;
    list-style: none;
    margin-top: 30px;
}

.main-nav li
{
    display: inline-block;
}

.main-nav li a
{
    color: white;
    text-decoration: none;
    padding: 5px 20px;
    font-family: "Roboto",sans-serif;
    font-size: 15px;
}

.main-nav li.active a
{
    border: 1px solid white;
}

.main-nav li a:hover
{
    border: 1px solid white;
}

.logo img
{
    width: 115px;
    height: auto;
    float: left;
    margin-top: 25px;
}

body
{
    font-family: monospace;
}

.row
{
    max-width: 1200px;
    margin: auto;
}

.hero
{
    position: absolute;
    width: 1200px;
    margin-left: 0px;
    margin-top: 0px;
}

h1
{
    color: white;
    text-transform: uppercase;
    font-size: 55px;
    text-align: center;
    margin-top: 275px;
}

.button
{
    margin-top: 30px;
    margin-left: 440px;
}

.btn
{
    border: 1px solid white;
    padding: 10px 30px;
    color: white;
    text-decoration: none;
    margin-right: 5px;
    font-size: 13px;
    text-transform: uppercase;
}

.btn-one
{
    font-family: "Roboto",sans-serif;
}

.btn-one:hover
{
    background-color: seagreen;
    transition: all 0.2s ease-in;
}

.btn-two
{
    font-family: "Roboto",sans-serif;
}

    .btn-two:hover
{
    background-color: darkorange;
    transition: all 0.2s ease-in;
}

解决方法

问题的原因是您的 .hero 元素具有绝对位置并且位于左上角（由于应用了默认设置），因此它与大多数其他代码重叠。你应该改变它。

你能看看下面的代码吗？希望它对你有用。在您的代码中，我们添加了类“navbar”以及“row”，并提供了相对位置和 z-index 以实现所需的要求。

请参考此链接：https://jsfiddle.net/yudizsolutions/f96mrp5x/2/

{
  margin: 0;
  padding: 0;
}

header {
  background-image: linear-gradient(rgba(0,0.05),rgba(0,0.05)),url(pic1.jpg);
  height: 100vh;
  background-size: cover;
  background-position: center;
}

.navbar {
  position: relative;
  z-index: 1;
}

.main-nav {
  float: right;
  list-style: none;
  margin-top: 30px;
}

.main-nav li {
  display: inline-block;
}

.main-nav li a {
  color: white;
  text-decoration: none;
  padding: 5px 20px;
  font-family: "Roboto",sans-serif;
  font-size: 15px;
}

.main-nav li.active a {
  border: 1px solid white;
}

.main-nav li a:hover {
  border: 1px solid white;
}

.logo img {
  width: 115px;
  height: auto;
  float: left;
  margin-top: 25px;
}

body {
  font-family: monospace;
}

.row {
  max-width: 1200px;
  margin: auto;
}

.hero {
  position: absolute;
  width: 1200px;
  margin-left: 0px;
  margin-top: 0px;
}

h1 {
  color: white;
  text-transform: uppercase;
  font-size: 55px;
  text-align: center;
  margin-top: 275px;
}

.button {
  margin-top: 30px;
  margin-left: 440px;
}

.btn {
  border: 1px solid white;
  padding: 10px 30px;
  color: white;
  text-decoration: none;
  margin-right: 5px;
  font-size: 13px;
  text-transform: uppercase;
}

.btn-one {
  font-family: "Roboto",sans-serif;
}

.btn-one:hover {
  background-color: seagreen;
  transition: all 0.2s ease-in;
}

.btn-two {
  font-family: "Roboto",sans-serif;
}

.btn-two:hover {
  background-color: darkorange;
  transition: all 0.2s ease-in;
}

<!DOCTYPE html>
<html>

  <head>
    <title>TITLE</title>
    <link href="style.css" rel="stylesheet" type="text/css">
  </head>

  <body>
    <header>
      <div class="row navbar">
        <div class="logo">
          <img src="logo1.png">
        </div>
        <ul class="main-nav">
          <li class="active"><a href=""> HOME </a></li>
          <li><a href=""> DOCUMENTS </a></li>
          <li><a href=""> LOGIN </a></li>
          <li><a href=""> ABOUT </a></li>
        </ul>
      </div>
      <div class="hero">
        <h1>Welcome</h1>
        <div class="button">
          <a href="" class="btn btn-one"> Watch Video </a>
          <a href="" class="btn btn-two"> Explore More </a>
        </div>
      </div>
    </header>
  </body>

</html>