CSS之布局系列--顶部导航栏二级菜单居中展示

红太狼 2024-03-30 13:25 45阅读 0赞

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][CSS_--_IT_-CSDN]

## 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>
                        <li class="second-menu"><a href="#">Docker</a></li>
                    </ul>
                </li>
                <li class="first-menu"><a href="#">关于本站</a>
                    <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>

## 测试 ##

![2793eecd970d4cd09afd08c9339fda11.png][]

[CSS_--_IT_-CSDN]: https://knife.blog.csdn.net/article/details/128500399
[2793eecd970d4cd09afd08c9339fda11.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/6ad7d9f70dd24285b1a83caf283fb097.png