I need to change the default hyperlink color of ALL emails sent from within CRM (and other modules).

I don't like the default Odoo green color. I want to use a blue color that most users know as a clickable link color.

I'm using Online 18. Is it possible to do this universally without having to make individual edits to each item I send, eg:
- Custom email
- Email template
- Quotation with a link
- Invoice with a link

I'd ideally like to apply this universally to every customer facing item I could possibly want to send.