refactor: 코드 하이라이팅 컬러 더 어둡게 변경

[msung99]

작업 내용 (Work Content)

다크 모드에서 코드 하이라이팅 컬러를 더 어둡게 변경함.

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관련 이슈 넘버 (Related Issue Number)

43

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