双恒 使用CSS创建一个固定的导航栏
要创建一个粘性导航栏，请使用position: sticky;属性。您可以尝试运行以下代码来创建一个粘性导航栏，
示例
实时演示
<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
position: sticky;
overflow: hidden;
top: 0;
width: 100%;
}
li {
float: left;
border-right: 1px solid white;
}
li a {
display: block;
padding: 8px;
background-color: orange;
}
li:last-child {
border-right: none;
}
div {
padding:5px;
margin-top:5px;
background-color:white;
height:1000px;
}
</style>
</head>
<body>
<ul>
<li><a href = #home>Home</a></li>
<li><a href = #news>News</a></li>
<li><a href = #contact>Contact</a></li>
<li><a href = #about>About</a></li>
</ul>
<div>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
<p>Adding demo text to check fixed menu.</p>
</div>
</body>
</html>
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