I came across this short and simple tutorial by Brian Gardner (the FrostWP theme I use on this blog currently is also by Brian Gardner) on registering an image block style and using it with a WordPress theme to create a nice white border that shows up with a photo you insert into a post.
A bit like how the photo below shows up. 🙂
The photo below is CC-0 and is available on WordPress.org/Photos to download.

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