How can I change the default background color of emails sent by EasySocial?

I have the current version of EasySocial installed on my test site at https://mygotgame.com/development

I am using the "Breeze" theme. I can see where I can edit the email templates that are being sent. However I cannot seem to find where I can change the default background color (#DBDFE2).

Please see the attached screen grab. Can you steer me in the right direction?

Thanks!