Gradient background problems with newsletter?

I’m a newbie to WordPress and creating the newsletter, so I’m hoping y’all can help a girl out!

When I’m designing my blocks, I’ve set the gradient background color on each, and it looks great on the site. However, when I sent a test to my email the gradient background didn’t show up, and it just look tacky having each block change colors so sharply.

Why are the settings changing when it’s being sent out?

 

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