Block Scroll but need content still viewable

I’m looking to block the scroll of one page of my mobile application but its content should be still visible for users. It is to prevent different scale of screen. Typically, I would like to apply this for my login page, which is much more beautiful and practicle if everything is showed directly on the screen, without needing to scroll.
I’ve already succeeded to block the scroll with;

But for now, my page is cut. Does someone have a solution for me?