margins too big on mobile

hi,

for a customer i am building a website, and on a desktop everything looks like she wants. On mobile however, everything is too small.

I am using the "one container boxed" layout and use elementor as builder.
the body has a background color, and the content part has a 70% wihite overlay.

The margins are too big, so the background color is visible left and right on mobiles. so much, that little space is left for the content. When a padding is used there, it really gets tiny.

Have a look on a mobile:
https://jeanneart.nl/

How can I solve this?

Thanks for your help!