Hello @mlchaves,
Thanks for your reply. Till a few weeks ago I was using WordPress Classic Editor and then I upgraded to WordPress 5.4 and I got the blocks system and that is what I am using now. As activated plugins I have Orbit Fox Companion and Image Optimisation service by Optimole.
The block element I am adding the border to is a section. These are the details for this block: “Add a Section block that displays content in multiple columns, then add whatever content blocks you’d like.”
Can you help with this information please?
Thanks