WP 8.1 soft keys over content on screen bottom

I am testing my App on Lumia 530. Device has no hardware buttons and windows soft keys (back, win, search) are located at screen bottom.Problem is that that navigation bar with soft buttons is over app content. It is as Cordova window is not aware of the fact that part of screen area is used by navigation bar.

I found plugin at https://www.npmjs.com/package/cordova-plugin-navbar but so far no luck in implementing it.

Any thoughts ?