Issue Summary

Bitbucket email notifications in Outlook mail client look broken, the view pull request, view comment button has blue tint which makes text within the button unreadable. 

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Download an outlook app and/or create an account in outlook.office.com
2. Trigger an event in Bitbucket such as push, PR creation etc.
3. The users who are watching the repository, PR will be notified via email.

Expected Results

The email notification from Bitbucket will render the View pull request, view comment buttons clearly as below.

Actual Results

The view comment, View pull request buttons are not rendered correctly. The text within the button is not visible clearly.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available