Why does margin not indent from all borders of the genus. element?

Question

css

Hi all! :)
Why does margin not indent from all borders of the genus. element if margin: 30px is specified; ?
(pictured is a div with a paragraph, inside the body)
Is it because the block size is fixed?

Answer 1

To be honest xs what do you mean, it's better to do sandboxes. Well, and so the collapse of margins