Change style of shortcode

Hello,

I am using the shortcode [ab-user-email] and it generates an automatic link in the e-mail. The rest of the links I have in the email are added in html with styles and i want to know how can I change the color of the e-mail link that is generated by the shortcode.

Thank you.

https://www.ads-software.com/plugins/html-new-user-notification-email/