Removing Custom Background on just one page

I am looking to remove the custom background of my site and just one of my pages. The theme is Weaver II

https://leasureportraits.com/newsletter/

I put this inside the Child Theme

body.page-id-74 {
    background-color: #FFFFFF !important;
}

Obviously that isn’t good enough because the custom background images is still showing in front of the white. Anyone know how to remove a custom background image on just one page so the white can be the background? If i can’t remove it at least swap the image for a jpg that is just a all white.

Thanks for the help.