Frameworks and the like
There is a conflict between the W3C Framework and the Bootstrap Framework.
I think that it will take some time to track this down. The W3 Portfolio template that I have developed over the years. The template still works but the w3-bar-items display with an underline on hover and regular links do not have an underline except on hover.
Actually the differences in the menu options caused by the linking of the Bootstrap framework are not too bad.
Bootstrap Links
This page demonstrates the Bootstrap Link Utilities.
or should!
The code is copied from the Bootstrap page to my template.
Link opacity
Link opacity 10
Link opacity 25
Link opacity 50
Link opacity 75
Link opacity 100
The result is different from what you will see on the Bootstrap page: getbootstrap.com/docs/5.3/utilities/link/
Top
Margins and borders are also different when using Bootstrap.
A straight link