CSS之布局系列--顶部导航栏二级菜单居中展示

news2025/7/20 13:10:47

原文网址：CSS之布局系列--顶部导航栏二级菜单居中展示_IT利刃出鞘的博客-CSDN博客

简介

本文介绍CSS将顶部导航栏居中展示并支持二级菜单下拉展示的方法。

代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>知识星球</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .top-container {
            background-color: #406ff9;
            height: 60px;
        }

        .menu-container {
            text-align: center;
        }

        .logo-container {
            position: absolute;
            color: white;
            line-height: 58px;
            font-weight: bold;
            margin-left: 10px;
        }

        .logo {
            font-size: 20px;
            margin-left: 10px;
        }

        .first-menu-container {
            display: inline-block;
            list-style: none;
        }

        .first-menu {
            line-height: 60px;
            text-align: center;
            float: left;
        }

        .second-menu {
            float: none;
            background-color: #406ff9;
        }

        .second-menu a:hover {
            color: white;
            background-color: #0033fc;
        }

        .second-menu-container {
            position: absolute;
            list-style: none;
            display: none;
        }

        .first-menu:hover ul {
            display: block;
        }

        a {
            text-decoration: none;
            color: white;
            display: block;
            padding: 0 15px;
            white-space: nowrap;
            font-weight: bold;
        }

        a:hover {
            background-color: #0033fc;
        }

    </style>
</head>
<body>
<div class="top-container">
    <span class="logo-container">
        <span class="logo">IT天空</span>
    </span>

    <div class="menu-container">
        <ul class="first-menu-container">
            <li class="first-menu"><a href="#">首页</a></li>
            <li class="first-menu"><a href="#">后端</a>
                <ul class="second-menu-container">
                    <li class="second-menu"><a href="#">Java基础</a></li>
                    <li class="second-menu"><a href="#">多线程</a></li>
                    <li class="second-menu"><a href="#">Spring</a></li>
                </ul>
            </li>
            <li class="first-menu"><a href="#">前端</a>
                <ul class="second-menu-container">
                    <li class="second-menu"><a href="#">HTML</a></li>
                    <li class="second-menu"><a href="#">CSS</a></li>
                    <li class="second-menu"><a href="#">JavaScript</a></li>
                </ul>
            </li>
            <li class="first-menu"><a href="#">运维</a>
                <ul class="second-menu-container">
                    <li class="second-menu"><a href="#">Linux</a></li>
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                <ul class="second-menu-container">
                    <li class="second-menu"><a href="#">作者介绍</a></li>
                    <li class="second-menu"><a href="#">github</a></li>
                </ul>
            </li>
        </ul>
    </div>

</div>
</body>
</html>