Google is testing another search results snippet hover effect. This one will color the background a light gray shadow like color. We've seen variations of this before (see articles below).

In this post, we will show you how to make a Natural Shadow for a composite image under an Object or Person in Photoshop. You can improve shadows to make them more realistic with lighting. Shadows are ...

“Think of your favorite color, now think of the next color that pops into your head,” Luna says. “That’s your shadow work color.” Shadow work is a ritual meant to heal your “shadow self.” Your “shadow ...