Here's an example for reference: https://standardstoryco.com/stress-relief-for-filmmakers/
This happens whenever I try to paste in content from my email newsletter directly into a WP post, or when I use the WP integration on my email platform (Convertkit) to automatically import/create a WP post from an email.
Seems like there's no way to get rid of these grey borders or hide them in the normal Elementor or WP editor. Is it a CSS thing?
Would love to automatically/universally get rid of them so it's not a manual process each time I import an email for a new post. Thanks in advance for any help!

The content is nested in a table, and the theme has it’s own styling rules for tables. If you don’t want **any** table to have borders, place this in your stylesheet (preferably child theme):
table {
border: none !important;
}