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In this snippet by Tommy Hodgins we can see the effect where the entire page is behind a fog of war like effect and is barely visible. When you move the mouse around you can see that there is a spotlight like effect, that reveals the content in that area, it kinda feels like pointing a flashlight onto the web page.

If you are having trouble with the pen, try the archived copy on GitHub

See the Pen
Mouse Cursor as Flashlight! 🖱🔦 using CSS Variables
by Tommy Hodgins (@tomhodgins)
on CodePen.