<div th:fragment="css">
    <link rel="stylesheet" href="/mobile/layui/css/layui.css">
    <style type="text/css">
        body {
            min-height: 100vh;
            position: relative;
        }

        .app {
            display: none;
        }

        @media (max-width: 500px) {
            .app {
                display: block !important;
            }
        }

        .pc {
            display: block;
        }

        @media (max-width: 500px) {
            .pc {
                display: none;
            }
        }

        #footer {
            position: absolute;
            bottom: 0px;
            left: 0;
            right: 0;
            height: 50px;
            line-height: 48px;
            text-align: center;
        }
    </style>
</div>