@media screen and (min-width: 1000px){
        body #chat_window .chat_box .chat_item {width: 40px;height: 40px;}
        body #chat_window .chat_box .chat_item::before {font-size: 26px;}
        body #chat_window .chat_box .menu #go_top {width: 40px;height: 40px;background-position: 0 -40px;background-size: 40px auto;}
    }