Mobile Version is showing light grey outline around columns/widgets. Can’t figure out where/how to adjust.

So basically, if you open this in mobile, you'll see that there is a grey area around the widgets/columns. I would like to figure out how to make that area the same white background that is used in the rest of the page.

www.donategnv.com

I am using WordPress/Elementor-Pro. I have tried to finegle with some code, but I couldn't manage to figure out how to adjust this.

Most of the page is placeholder material, so don't pay attention to any of that nonsense text. Thank you in advance for any advice you may have!