What’s the best practice for button alignment in responsive email templates?

I was looking for case studies or UX research to figure out what is the best practice for button alignment especially in email templates, but couldn't find anything relevant.

Our practice:

  • We tend to align buttons to left on the desktop version

  • Buttons on the mobile version are automatically stretched to full width

Can you refer any study / research / whatsoever which deals with this topic?

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