Hi Cynthia,
You can try placing all the Blocks in your Home page inside one Container Block instead, and then set a Background image as such: https://share.getcloudapp.com/yAuKyDvB
Alternatively, you can add this custom CSS in Appearance > Customize > Additional CSS:
.home .site-content .inside-article {
background-image: url('https://leakdetectionandrepairpros.com/wp-content/uploads/2022/02/main-water-line-pipe-leak-las-vegas.jpg');
}
Kindly replace the url to your image’s URL.
Hope this clarifies. 🙂