@media (max-width: 820px){
  /* 取消 #chat_window 的 0.88 缩放（这是主题为了让原 35x35 图标看起来更小的 hack） */
  #chat_window{transform:none !important}
  .box .box_size{width:48px !important;height:auto !important;right:14px !important;bottom:20px !important}
  .box .box_size .chat_item{width:48px !important;height:48px !important;line-height:48px !important;font-size:24px !important;margin-bottom:8px !important;border-radius:24px !important}
  .box .box_size .more{width:48px !important;height:48px !important;line-height:48px !important;font-size:22px !important;border-radius:24px !important}
}