We shall set up a fallback image for Pages that do not have featured images.
Let's define a custom size for the body background images.
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Custom Image Sizes
add_image_size( 'body-background', 1680, 1050, true );
If your site's Pages already have featured images set, regenerate thumbnails.
Add another Code Snippet.
Title: Set featured image as body background
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