Font-size in navigation bar (inside global navigation) unconsistent

Using Concrete / Help
1

Hello everyone,

the website I’m currently working on seems to have an issue I can’t really get behind.
Inside the global navigation, there’s a navigation bar leading to most of the existing subpages. All text elements of the navigation have a common font-size.

What happened is that the font-size suddenly started to change whenever I click on a specific subpage (“Kontakt”).

As soon as I go to another subpage the font-size is back to normal.
I never changed a thing in the block design & templates or the options for the block itself. When I tried to find a clue of what happened, I searched through the browsers dev tools and found this:
The font-size of the element is crossed out aswell as the color. That’s only the case for this specific subpage.

Is there anyone who had a similar issue or has an idea how to fix that? I’d really appreciate any help.

Screenshots for context:

Screenshots
Screenshots1920×1080 232 KB

Concrete version 9.2.1
PHP version 8.3.8

2

In the kontact page you have some overriding css like this on line 375

    <!DOCTYPE html>
<html>
    <style type="text/css">
        body{
            font-size: 90%;
            color: black;
            padding: 5px;
        }
        .contact-txt{
            color: black;
        }
    </style>
    <body>
        <br>
        <br>
        <section class="contact-txt">
            <p>Ingenieurbüro für<br>Simulationsdienstleistung</p>
            <p><strong>Ralf Gruber</strong></p>
            <p>Haselweg 10<br>32278 Kirchlengern</p>
        </section>
            <p>
                Telefon: <a href="tel:+4916097791353" class="tel-txt">0160 97791353</a><br>
                Mail: <a href="mailto:kirchlengern@fs-ad.de" class="mail-txt">kirchlengern@fs-ad.de</a></p>
    </body>
</html>
3

Oh I see! Changing “body” to “.contact-txt” in solved the issue. Weird one, since it only started affecting the nav bar a few days ago.
Thank you very much!