@divinedolphin That was from the Module 3 Day 16 Challenge Part 3 video, around timestamp 2:45. Except I think I fixed that already....
@The-Rogue-Blade You are observant! It's because the graphic in the question is taken directly from the video (it's a screenshot of Prof. Loh's writing). And the color of the pen wouldn't stand out against the purple background.