Underline link styling renders incorrectly in Firefox

[kattyode]

Description:

Underline link styles appear visually inconsistent in Firefox compared to expected design.

Steps to Reproduce:

1. Open Firefox
2. Navigate to a page containing underlined links, for example:

https://www.cppal-dev.boost.org/v3/accounts/login/

https://www.cppal-dev.boost.org/v3/demo/learn-page/

3. Observe the appearance of underlined links

Actual Result:

Underlined links render incorrectly in Firefox (visual inconsistency in underline styling).

Expected Result:

Underline links should match the design defined in Figma and render consistently across all supported browsers.

[kattyode]

@julioest I tested it again, but I'm still seeing the errors in the site: