fix(status-bar): adjust styling to address jitter
fix(status-bar): adjust styling to address jitter

Add `backface-visibility` property to address jitter in Google Chrome. The property does not affect 2D transforms, which have no perspective in any other browser but Google Chrome. It's the least intrusive way to force Chrome to render the respective layers properly.

Closes DCOS-20392

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui