Broken CSS in nav_bar apps page?

I'm creating a nav_bar app but the size of the parent element makes it impossible to create an app that fills the screen. The parent .sc-1heucuy-0 eSzOq (probably some unique id but it's the 3rd parent element of the app iframe) element (outside of my app) has invalid CSS properties. It doesn't take the title bars into account and makes the app always overflow by 50px.

It has a CSS property as such: height: calc(-50px + 100vh); which only takes one of the title bars into account, but there's 2; one for ticket tabs and one for the app itself. This makes it virtually impossible to make the app fill the screen properly.