Sorry to hear about the inconvenience. Kindly, please share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.
Your issue has been resolved. Navigate to layouts > Edit Product Archive layout with Elementor > Edit Product Archive layout and in the style tab set the custom background color.
Check back your site and check the shop page after completely clearing the browser cache or check the issue in the incognito window. For the home page color simply edit the page with elementor and change the background color.