   vertical-align: middle;
            line-height: 50px;
            padding: 0 5px;
            color: #fff;
            float: right;
        }

        .user_link a {

            color: #fff;
        }

    </style>


</head>
<body>


<!-- 你的HTML代码 -->
<a name="top"></a>
<ul class="layui-nav app" lay-filter="" style="display:none;padding:0 10px;text-align: center">
    <li class="layui-nav-item"><a>分类</a>
        <dl class="layui-nav-child">
            <dd><a href="/book/book_ranking.html?