Dark Theme Option

Great app, runs really smooth and is really easy to use, it is 99% there to being as easy to use as on a desktop.

One consideration should be a "Dark" theme so that we have the option of changing the background to a dark colour such as grey, this will help reduce battery usage and reduce eye strain, it would be greatly appreciated!

No other objections, awesome app!

322312 about Yahoo Mail, v4.3