[css] 请使用css写一个多级的下拉菜单

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        a {
            text-decoration: none;
        }

        ul li {
            float: left;
            position: relative;
            list-style: none;
            margin: 3px;

        }

        ul li a {
            width: 100px;
            display: block;
            text-align: center;
            padding: 10px 20px;
            background-color: #e8e8e8;
        }

        ul li ul {
            display: none;
            position: absolute;
            left: 0;
            top: 100%;
        }

        ul li:hover>ul {
            display: block;
         
        }

        ul li:hover>a {
            background-color: bisque;
        }

         ul li ul li {
            clear: both;
            position: relative;
        }

         ul li ul li a {
            width: 150px;
            border-top: 1px solid white;
        }

         ul li ul li ul {
            display: none;
            position: absolute;
            left: 100%;
            top: 0;
        }
    </style>
</head>

<body>
    <ul>
        <li>
            <a href="">11111111</a>
        </li>
        <li>
            <a href="">11111111</a>
            <ul>
                <li><a href="">2222</a></li>
                <li><a href="">222</a>
                    <ul>
                        <li><a href="">2222</a></li>
                        <li><a href="">222</a>
                    </ul>
                </li>
            </ul>
        </li>
    </ul>
</body>

</html>

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