body #chat_window{right: 15px;bottom: 80px;}
body #chat_window .chat_box .menu a{width: 48px;height: 48px;background-size: 48px auto;}
body #chat_window .chat_box .chat_item{width: 48px;height: 48px;}
body #chat_window .chat_box .chat_item::before{font-size: 30px;}
body #chat_window .chat_box .menu .top{background-position: 0 -50px;}
@media screen and (max-width: 1000px) {
    body #chat_window .chat_box .menu #go_top {background-position: 0 -50px;}
}