更改背景主题

https://www.cnblogs.com/shwee/p/9060226.html#dingzhi10
https://www.cnblogs.com/shwee/p/9084535.html

markdown and \\(\\LaTeX\\)

https://blog.csdn.net/qq_41851959/article/details/82987974
https://www.luogu.org/blog/IowaBattleship/latex-gong-shi-tai-quan