I would like to add some fancy CSS and HTML in the system workflow messages. I know there’s a section to add a header logo. But I was wondering if there’s an ideal way to make the entire format responsive like modern emails. I have tried copying and pasting some CSS HTML from mail chimp although it works but In th drupal log there’s 100s error (User error: smarty......) gets registered per email is sent.
If someone has done already something like this I would be very grateful if you share your sample code please. Or even some suggestions would be greatly appreciated.