Gboard introduces floating keyboard to Android app

While not exactly a new, groundbreaking feature, a new floating keyboard mode is coming to Gboard on Android. Version 7.6 of the app will let place the keyboard where you want to. If you want to use it, just head over to the expanded menu option on the top left corner of the keyboard. When you have this on, you can freely move the keyboard where you want to and resize it if you want. 

Source: XDA Developers