Как изменить макет превью дайджеста

[Canapin (Coin-coin le Canapin)]

Не уверен, что это всё ещё актуально, но поиск выдал следующее:

Customizable Email Templates

Unfortunately the digest doesn’t use our normal template code as it uses a custom ruby template due to their being a lot of display logic present. You can now customize all the text though!

How to change the style of the email template of the digest?

Unfortunately the only part of the digest that is editable is the logo, which can be done via site settings. CSS in email is quite a tricky task, so we’ve hardcoded the styles in the template: