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Removing padding and margin from email template body

I would like to remove the default padding and margin around the html template when sending an email blast. Can anyone point me to which file to edit to achieve this? Thanks in advance.

Hi, which template are you using?

Not any specific one. I am using the message editor, but it adds
padding or a margin all around the body and I would like to remove
that. Where is the template for that located?