Windows Phone 8.1 System-Navigation Bar

Hi there,

i started to develope my first app with the ionic-Framework and it ist awesome. My target OS ist WP 8.1 for my company. But i have one problem. The system nav bar at the bottom hides a litte bit of the window, so that the app ist to big for the screen.
The best would be to auto hide the nav bar. But when i search in the internet, it seems not working. The next best step would be to scale the app in the height, but i don’t know how.

I have to hide the fields and the logo.
Sry if english isn’t the best.

Greetings from germany,