Expected Behavior
The veryfication code is invisible.

Current Behavior
The verification code should be clearly visible.

Possible Solution
Change the CSS in the default email template

<div style='font-weight: bold;line-height: 50px;height: 50px;color: #FFF;背景。#a5b3bd;text-align: center;width: 200px;margin: 0 auto;border-radius: 5px;'>{{ confirm_code }}</div>

"color: #FFF;背景。#a5b3bd" <- invalid CSS code

Steps to Reproduce

1. Post a comment on Feedback.
2. Receve the verification Email
3. Can't see the verification code in the Email (as attachments.)

Context (Environment)
Language: Chinese (tradionnal)
Mail system: Gmail