纯css实现二级导航

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>企业搜索页面</title>
    <style>
        *{
            margin:0;
            padding:0;
        }
       .nav{
           margin-top:100px;
           width:100%;
           height:40px;
           background:#4aca6d;
       }
        .nav ul{
            width:1200px;
            height:inherit;
            margin:0 auto;
        }
        .nav ul li{
            width:188px;
            float:left;
            height:40px;
            line-height:40px;
            font-size:14px;
            text-align:center;
            color:#fff;
            list-style: none;
            cursor: pointer;
        }
        .nav ul li:hover{
            width:188px;
            height:40px;
            background:#09a800;
        }
        .nav_question:hover .nav_item,
        .nav_select:hover .nav_item,
        .nav_uesr:hover .nav_item,
        .nav_feature:hover .nav_item{
            display: block;
        }
        .nav_item{
            width:100%;
            background-color: rgba(243,243,243,.95);
            display: none;
        }
        .nav_item p{
            color:#999;
        }
        .nav_item a{
            color:#999;
            text-decoration: none;
        }
        .nav_item a:hover{
            color:#999;
            text-decoration: underline;
        }
    </style>
</head>
<body>
<div class="nav">
    <ul>
        <li>首页</li>
        <li class="nav_question">
            问题
            <div class="nav_item">
                <p><a href="">知道专栏</a></p>
                <p><a href="">知道非遗</a></p>
                <p><a href="">知道大数据</a></p>
                <p><a href="">知道大数据</a></p>
            </div>
        </li>
        <li class="nav_select">
            精选
            <div class="nav_item">
                <p><a href="">知道专栏</a></p>
                <p><a href="">知道非遗</a></p>
                <p><a href="">知道大数据</a></p>
                <p><a href="">知道大数据</a></p>
            </div>
        </li>
        <li class="nav_uesr">
            用户
            <div class="nav_item">
                <p><a href="">知道专栏</a></p>
                <p><a href="">知道非遗</a></p>
                <p><a href="">知道大数据</a></p>
                <p><a href="">知道大数据</a></p>
            </div>
        </li>
        <li class="nav_feature">
            特色
            <div class="nav_item">
                <p><a href="">知道专栏</a></p>
                <p><a href="">知道非遗</a></p>
                <p><a href="">知道大数据</a></p>
                <p><a href="">知道大数据</a></p>
            </div>
        </li>
    </ul>
</div>
</body>
</html>
纯css实现二级导航

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