@media screen and (min-width: 768px) {
body #chat_window .chat_box .chat_item{width: 65px;height: 65px;}
body #chat_window .chat_box .chat_item .iconfont{font-size: 32px;}
body #chat_window .chat_box .menu a{width: 65px;height: 65px;}
body #chat_window .chat_box .menu .top{background-position: 7px -45px;}
}