Cordova сжимается страница при уменьшении экрана

I am making a simple form on Cordova using Vue.js. I need to make a form that will keep it's size when on-screeen keyboard is shown. But I also need to keep a login button at the bottom of the screen when keyboard is not shown. Bot when screen keyboard pops up, the viewport height is shrinked. How Can I stop my page from moving the button up?

When My keyboard is shown I want to have this look