It is a R Studio Theme used some tradition Chinese colors
These colors are generated from Chinese Colors
Screenshot of this theme:
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Download one of the .tmTheme file (https://github.com/jiehua1995/R-Studio-theme-China/blob/main/China.tmTheme).
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In RStudio, go to Tools → Global Options → Appearance.
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Click the Add button underneath the list, choose your downloaded .tmTheme, and click Open.
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Click Apply to apply the theme.