Discrepancies in Outline FillMode between components

[epetrow]

Describe the bug

The Design team have flagged a couple of discrepancies in the Outline FillMode between components, namely in background-color.

At the moment we are appying a transparent background-color in the case of the Button, while setting #ffffff for Chip and Badge.

Note these are just the first cases that have been flagged and there might be more

To reproduce

Steps to reproduce the behavior:

1. Go to any Chip/Badge appearance demo, select Outline fillMode and inspect it in DevTools
2. Then go to any Button demo and do the same
3. Observe the difference in the background-color being applied

Expected behavior

Have a unified approach when it comes to Outline fillMode backgroud-color across all components

Affected package (please remove the unneeded items)

• theme-default
• theme-bootstrap
• theme-material