The issue is in windows 10 system the submit button is not rendering properly in Outlook 2016 on the Dell XPS which by default has a 3200x1800 screen resolution with a magnifying ratio set to 250%.
The notification mail look and feel is getting changed.

Tried opening the email in different PC with Wndows 10 configuration it seems to be working fine.
But challenge is our customer is using Dell XPS (QHD) ** display machines which by default has a **3200x1800 screen resolution with a magnifying ratio set to 250% and there the email is not getting rendered properly.