Now you can choose between a dark or light theme for the app. This setting will only affect this mail app and change any other phone settings.
1. Tap the Nav icon at the left of your navigation bar to open the Navigation Drawer.
2. Tap the Gear icon at the bottom of the Navigation Drawer to bring up Settings.
3. Tap Appearance.
4. Tap Theme.
5. Tap to select between Light and dark.
6. Tap Ok.
Note: The app background will change instantaneously.