<!DOCTYPE html>
<html>
<head>
<style>
body {margin:0;}
ul { list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
position: fixed;
bottom: 0;
width: 100%;
}
li { float: left;
}
li a { display: block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover:not(.active) { background-color: #111;
}
.active { background-color: #4CAF50;
}
</style>
</head>
<body>
<ul>
<li><a class="active" 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 style="padding:20px;background-color:#1abc9c;height:1500px;">
<h1>固定的底部导航栏</h1>
<h2>请滚动页面以查看效果。</h2>
<h2>页面滚动时导航栏将位于页面底部。</h2>
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</div>
</body>
</html>