Problem in the Django tutorial?

I'm doing the Django tutorial and got stuck on the static files section: https://docs.djangoproject.com/en/2.1/intro/tutorial06/#customize-your-app-s-look-and-feel 

Could not get the style.css file to work despite triple-checking everything. 

After much research, I got it to work by adding this to settings.py:

STATICFILES_DIRS = (      os.path.join(BASE_DIR, "static"),  )

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