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MaterialUp is a showcase site for examples of material design, the design language put forth by Google.

There are lots of examples of material design here on CodePen. Here's a collection of my own. Searching brings up quite a bit too.

When you're browsing MaterialUp, the examples they feature that are from CodePen feature a little CodePen icon in the footer of the card. Clicking that will jump you over to the Pen (although it seems like you have to be logged in for that to work - not sure if feature or bug).

Clicking the card itself will open a drawer with the Pen embedded right there for you to play with.