Paper
In Material Design, the physical properties of paper are translated to the screen.
The background of an application resembles the flat, opaque texture of a sheet of paper, and an application's behavior mimics paper's ability to be re-sized, shuffled, and bound together in multiple sheets.
<Paper elevation={0} />
<Paper />
<Paper elevation={3} />
<Paper variant="outlined" />
<Paper variant="outlined" square />