usergui
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/460400/1157130/userguijs.js
this script is modified only to work with : https://greasyfork.org/en/scripts/460147-c-a-s-chess-com-assistance-system
2 things are modified: title + onclick close button