How do I allow the background color of the page shown between the posts using WPShowPosts?
In this example (https://ibb.co/cYFzKyp), there is only white space between the posts, and the gray site background color does not show through as gray stripes between the posts.
I don’t see any options to set something like “gutter color” or similar.
I think you will need to set the content background color to gray or color of your choice. Looks like you are using GeneratePress so go to Customize > Colors > Content.