1. Download the .zip file from the site below.
https://github.com/jeffThompson/DarkArduinoTheme
2. Unzip the file downloaded.
3. Paste (overwrite, 대상 폴더의 파일 덮어쓰기) the theme folder in the extracted folder to the Arduino path installed.
ex) C:\Program Files (x86)\Arduino\lib
[Before Arduino IDE theme]
[After Arduino IDE theme]