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Not a lot of context here. Was the "CSS toggle" an image inside a video?

Yes, it's poorly titled. The copyright was for the image/animation.

I still don't understand. What was the topic of the video, and how was the image/animation involved?

it was just used as interstitial animation to show the time of day changed between shots

it doesnt really have anything to do with CSS

Some video editor is getting fired.