Why are some entries in the grade book pink and darker pink?
Here are some lessons from the Canvas Instructor Guide explains the colors:
Pink is a late submission in the old gradebook. The new gradebook doesn't have pink, but it has red, which looks kind of pinkish on their screenshot. Red in the new gradebook is for a missing assignment.
The tables are striped so that every other row has a darker background to that you can follow the results across without getting lost. That makes for light and dark shades of the same color, but whether it's light or dark doesn't mean anything, it's the color that matters.
Retrieving data ...