Here are the files to setup custom themes in ReText. I've added a "new" style: Monokai (editor) and github (preview) mixed.
The theme list:
- breeze-dark
- Default
- github
- Monokai
- MonokaiGithub
- solarized-dark
The original files are files were obtained from:
https://github.com/a-mt/retext-themes
You can get extra information in Github retext project: