Email template good in Thunderbird but broken in gmail mobile

General Discussion
1

I’ve setup an email based off the blank-template and in Thunderbird it properly displays well the layout.

Particularly:

  1. a CTA button
  2. some bold texts below the CTA

But in gmail the layout is broken.

How do I debug this?

PD: In Thunderbird (photo 1) and in gmail (photo 2):

image
image643×851 35.2 KB

image
image540×1170 104 KB