In emacs, how do I highlight and flash current line with a changing backcolor as the following video did?

In this video: Org-roam-bibtex - Quick Presentation]1, the background color of the active line will be temporarily changed and flashed. Can anyone call tell me how to do it, pelase?

Solution

That is Beacon mode. It eases finding the cursor (point) when changing windows or when scrolling.

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