How do I make the gaps smaller between bllocks?

I would love if all these blocks displayed way tighter and closer to one another. Is this a theme default setting somewhere 'blocks require borders' or something?

Even the divider has this big border.

https://preview.redd.it/5u3kbgrnqotd1.png?width=635&format=png&auto=webp&s=9d8b107c40740424cd1ed4f102bd94ac941bd0c3

 

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