.config/Typora/themes/Readme.md

   1 The built-in CSS will be replaced after update / reinstall, DO NOT MODIFY THEM.
   2
   3 Refer https://support.typora.io/Add-Custom-CSS/ when you want to modify those CSS.
   4 Refer https://support.typora.io/About-Themes/ if you want to create / install new themes.