我使用伪元素 :before 来帮助固定背景图片，因为如果不这样做，由于背景附件重绘功能，它会导致我的网站滚动缓慢。我修复了背景图像以使其运行流畅，但现在背景图像溢出整个文档，而不是停留在 div 中。
我尝试过使用不同的溢出选项，并尝试将控制伪元素的英雄类放在不同的元素上，看看是否有帮助。
https://jsfiddle.net/4prhubwy/
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Ukiyo Sushi ツ</title>
<link href = "/style.css" type = "text/css" rel = "stylesheet">
<link href="https://fonts.googleapis.com/css?family=Fira+Sans&display=swap" rel="stylesheet">
</head>
<body>
<div class = "hero">
<header>
<nav class = "navbar">
<a href = "#" class = "logo">Ukiyo Sushi ツ</a>
<ul>
<li><a href ="#" class = "about">About us</a></li>
<li><a href = "#" class = "menu">Menu</a></li>
<li><a href = "#" class = "services">Services</a></li>
<li><a href = "#" class = "contact">Contact</a></li>
</ul>
</nav>
<div class = "sushiPlatter">
<h2>Chef's Special Sushi Platter</h2>
<br>
<a href = "#">View Menu</a>
</div>
</header>
</div>
<section class = "idkYet">
<div>
<span>hello</span>
</div>
</section>
</body>
</html>
CSS:
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
a{
text-decoration: none;
color: white;
/*overflow: hidden;*/
}
.hero{
position: relative;
overflow: hidden;
min-height: 100%;
}
.hero::before{
background-image: url("/img/header.jpg");
background-repeat: no-repeat;
background-position: center top;
background-size: cover;
content: '';
height: 100%;
position: fixed;
left: 0;
top: 0;
width: 100%;
will-change: transform;
z-index: -1;
}
body{
font-family: "Fira Sans", sans-serif;
font-size: 2rem;
color: white;
}
.logo{
font-size: 3rem;
margin: .5em;
border-bottom: 2px solid transparent;
}
.logo:hover{
border-bottom: 2px solid white;
}
.navbar{
/*position: fixed;*/
display: flex;
flex-direction: row;
justify-content: flex-start;
}
.navbar ul{
display: inline-flex;
list-style: none;
margin-left: auto;
}
.navbar li{
margin: 1.15em;
border-bottom: 2px solid transparent;
}
.about:hover, .menu:hover, .services:hover, .contact:hover{
border-bottom: 2px solid white;
}
.sushiPlatter{
font-size: 1rem;
text-align: left;
display: flex;
height: 100vh;
flex-direction: column;
align-items: flex-start;
justify-content: center;
margin: 2.15em 2em;
}
.sushiPlatter h2{
font-weight: bold;
}
.sushiPlatter a{
margin: 0em 7em;
}
.sushiPlatter a:hover{
opacity: .25;
transition: 1s;
}
section{
height: 100vh;
color: black;
}
.idkYet{
color: white;
display: block;
}
最佳答案
为元素的其余部分添加背景，以便在其顶部滚动时隐藏伪元素，例如此处的部分:
例子
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/* selector moved here to be seen */
section {
height: 100vh;
color: black;
background: white;/* rule added , use your own color or img */
}
/* end selector moved */
a {
text-decoration: none;
color: white;
/*overflow: hidden;*/
}
.hero {
position: relative;
overflow: hidden;
min-height: 100%;
}
.hero::before {
background-image: url(https://i.imgur.com/bs8H4p7.jpg);
background-repeat: no-repeat;
background-position: center top;
background-size: cover;
content: '';
height: 100%;
position: fixed;
left: 0;
top: 0;
width: 100%;
will-change: transform;
z-index: -1;
}
body {
font-family: "Fira Sans", sans-serif;
font-size: 2rem;
color: white;
}
.logo {
font-size: 3rem;
margin: .5em;
border-bottom: 2px solid transparent;
}
.logo:hover {
border-bottom: 2px solid white;
}
.navbar {
/*position: fixed;*/
display: flex;
flex-direction: row;
justify-content: flex-start;
}
.navbar ul {
display: inline-flex;
list-style: none;
margin-left: auto;
}
.navbar li {
margin: 1.15em;
border-bottom: 2px solid transparent;
}
.about:hover,
.menu:hover,
.services:hover,
.contact:hover {
border-bottom: 2px solid white;
}
.sushiPlatter {
font-size: 1rem;
text-align: left;
display: flex;
height: 100vh;
flex-direction: column;
align-items: flex-start;
justify-content: center;
margin: 2.15em 2em;
}
.sushiPlatter h2 {
font-weight: bold;
}
.sushiPlatter a {
margin: 0em 7em;
}
.sushiPlatter a:hover {
opacity: .25;
transition: 1s;
}
.idkYet {
color: white;
display: block;
}<div class="hero">
<header>
<nav class="navbar">
<a href="#" class="logo">Ukiyo Sushi ツ</a>
<ul>
<li><a href="#" class="about">About us</a></li>
<li><a href="#" class="menu">Menu</a></li>
<li><a href="#" class="services">Services</a></li>
<li><a href="#" class="contact">Contact</a></li>
</ul>
</nav>
<div class="sushiPlatter">
<h2>Chef's Special Sushi Platter</h2>
<br>
<a href="#">View Menu</a>
</div>
</header>
</div>
<section class="idkYet">
<div>
<span>hello</span>
</div>
</section>关于html - :before pseudo element is not staying in div，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58624164/