Formatting link text in signature layout with embedded link.

I'm trying to set up a signature rule to use Calendly links specific to each User. Our brand guidelines require the link render in our brand color but when the email is test launched in Outlook, it's the link default blue.

I've tried formatting the text in the Src and Rich editors, but the html code is stripped by Eloqua when I save it. I don't want this launching as blue text. What code can I add to this so it renders the link in our brand color?