When the screens become bigger there comes unwanted white space down the page

Hi

I am using an iFrame with a page of our Mx App, whereby the background color is gray.

I noticed that when the screens become bigger there comes a unwanted white space with the classes mx-layoutcontainer-center mx-scrollcontainer-center.

My question is:

1 - Is it possible to disabl this behaviour?

2 - Otherwise is it possible to change/overrule this unwanted white space so that is same gray as the rest of the page?