Bug, feature request, or proposal:
Buy, maybe, or maybe this is intended ????
What is the expected behavior?
Elevation should continue on into the scroll area in my opionion.
What is the current behavior?
Putting a simple html table in a div with Mat-elevation shows slighly ugly result when a scrollbar comes into play.

What are the steps to reproduce?
https://stackblitz.com/edit/angular-hta4it-44hwq3?file=app/radio-overview-example.html
Which versions of Angular, Material, OS, TypeScript, browsers are affected?
Angular 6.1.0
Material 6.4.1
See this behaviour on Edge and Chrome