Change Ionic 4 CSS and make Full Screen

I am trying to replicate the following UI layout but can’t get the borders styling, I don’t know if there is a way to accomplish it in Ionic.

This is what I have so far:

I am using the following border-radius: border-radius: 0 0 0 3rem;
I have two issues as incricled in blue can’t get that type of border using css and and make it fullscreen (Already added fullscreen property <ion-content no-padding fullscreen class="…)

Also regarding the bordering after doing dome research I found this stackoverflow: but I don’t know if there is an easy way or trick to do the same.