@media screen and (min-width: 1000px) {
    body #chat_window .chat_box .chat_wechat .more_box .hidden {width: 100% !important;}
    body #chat_window .chat_box .more_box .wechat_item {width: auto;}
    body #chat_window .chat_box .more_box .wechat_item .wechat_code {width: 155px;height: 155px;}   
}