How to underline the links in the menu and remove underline from active page?

Site URL: https://wombat-parrot-z3lx.squarespace.com

I'd like to change the way links appear in the navigation: at the moment the active page is underlined, while other linked pages in the navigation are not.
I'd like to do the opposite, as it's better for accessibility: links underlined, active pages not.

I don't see a way to do this using the styling options at hand, hope I'm not being blind...

50 minutes ago, Lauret said:

Site URL: https://wombat-parrot-z3lx.squarespace.com

I'd like to change the way links appear in the navigation: at the moment the active page is underlined, while other linked pages in the navigation are not.
I'd like to do the opposite, as it's better for accessibility: links underlined, active pages not.

I don't see a way to do this using the styling options at hand, hope I'm not being blind...

Your site is private now. Can you share your site with the protected password so I can take a look?

Uuups!

The password is knock-knock

17 hours ago, Lauret said:

Uuups!

The password is knock-knock

Add to Design > Custom CSS

div.header-nav-item--active>a {
    background-image: none !important;
}
div.header-nav-item>a {
    background-image: linear-gradient(currentColor,currentColor);
    background-repeat: repeat-x;
    background-size: 1px 1px;
    background-position: 0 100%;
    background-position: 0 calc(100% - 0.1em);
}

It works!
Thanks a lot