Please add example usage on using Shadow Elevation and Shadow Layer

[bond-]

https://codelabs.developers.google.com/codelabs/mdc-103-swift/ says it covers shadow elevation but doesn't have those details anywhere in text.

[BigDada1]

To set the next button's elevation, add in LoginViewController.swift this code after the button color styling:
self.nextButton.setElevation(.cardResting, for: .normal)

Additional documentation about shadow elevation can be found at https://material.io/develop/ios/components/shadows/shadow-elevations/