How did Google make these 3d buttons? [closed]

Tags: css,material-design

Problem :

How did they make those 3d buttons with the shadows for their doodle AI thing

They look like this:

picture of the google button in question

I snooped around in the CSS, but there's nothing special in the element's styles.

EDIT: If you're going to instantaneously downvote, could you tell me why, so I can try to fix the problem?

Solution :

It's a background image sprite:

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