인프런 커뮤니티 질문&답변
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답변 1
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Your code is not that much visible but from looking at it of what is available, I think that the reason is because you have written
screen.blit(background, (0,0))
You should try writing
screen.blit(background, (2,3))
or some other possibilities to have other colours...
For further queries, refer to best python tutorial.