导航栏（css教程里的，感觉以后可以这样用，没有使用浮动）

本文介绍了一个使用HTML和CSS实现的固定全高度侧边导航栏案例。该导航栏固定于页面左侧，具备自动滚动功能，适用于拥有大量菜单项的情况。文章详细展示了如何设置导航栏样式，并保持其始终可见。

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>导航栏</title>
    <style>
        body {
            margin: 0;
        }

        ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            width: 25%;
            background-color: #f1f1f1;
            position: fixed;
            height: 100%;
            overflow: auto;  /* 如果导航栏选项多，允许滚动 */
        }

        li a {
            display: block;
            color: #000;
            padding: 8px 16px;
            text-decoration: none;
        }

        li a.active {
            background-color: #4CAF50;
            color: white;
        }

        li a:hover:not(.active) {
            background-color: #555;
            color: white;
        }
    </style>
</head>
<body>

<ul>
    <li><a class="active" href="#home">主页</a></li>
    <li><a href="#news">新闻</a></li>
    <li><a href="#contact">联系</a></li>
    <li><a href="#about">关于</a></li>
</ul>

<div style="margin-left:25%;padding:1px 16px;height:2000px;">
    <h2>Fixed Full-height Side Nav</h2>
    <h3>Try to scroll this area, and see how the sidenav sticks to the page</h3>
    <p>Notice that this div element has a left margin of 25%. This is because the side navigation is set to 25% width. If you remove the margin, the sidenav will overlay/sit on top of this div.</p>
    <p>Also notice that we have set overflow:auto to sidenav. This will add a scrollbar when the sidenav is too long (for example if it has over 50 links inside of it).</p>

</div>

</body>
</html>