第三课-盒子模型-导航栏 -

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型-导航栏</title>
    <style>
        ul,li,body{
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }
        a{
            text-decoration: none;
            color: #666;
            display: inline-block;
            text-align: center;
            padding: 20px 40px;
            width: 100px;
        }
        li{
            list-style: none;
        }
        nav>ul{
            background: rgb(241, 224, 224);
            display: flex;
            justify-content: center;
            position: relative;
        }
        nav>ul>li:hover{
            background: rgb(236, 135, 135);
        }
        nav>ul>li>ul>li:hover{
            background: rgb(236, 135, 135);
        }
        nav>ul>li:hover>ul{
            display: block;
        }
        nav>ul>li>ul{
            background: rgb(241, 224, 224);
            position: absolute;
            display: none;
        }
    </style>
</head>
<body>
    <nav>
        <ul>
            <li><a href="">首页</a></li>
            <li><a href="">前端学习</a>
                <ul>
                    <li><a href="">html</a></li>
                    <li><a href="">css</a></li>
                    <li><a href="">javascript</a></li>
                </ul>
            </li>
            <li><a href="">后端学习</a>
            <li><a href="">我的</a>
                <ul>
                    <li><a href="">资料修改</a></li>
                    <li><a href="">退出登录</a></li>
                </ul>
            </li>
        </ul>
    </nav>
</body>
</html>