Show notifications and then remove the alert

I have a page with several menu items. With the exception of the Notifications page, if I am on any page and I receive a notification, for example my score is above 70%, the Notifications menu item indicates that I have received a notification by changing the notification text to red letters.
By default, all menu item letters are white.
In php, after the query and calculation, when the score reaches 70%, the notification menu item changes to red. I want when I open the notifications page, the notification menu item to change from red to white.
When the calculation score reaches 80%, the notification menu item should turn red again. And it should be white again when I open the notifications menu.
So it should work on a similar principle to a chat application, when I get a message it should indicate, and when I open it, it should no longer indicate that I have received a message.
My problem is that although the notification menu item turns white when I open it, when I open another page it turns red again.
So, staying with the chat app example, if I open my message and exit or go to another page, it doesn’t indicate that I’ve received a message because I’ve already opened it.
Here is my code:

example.php:

<body>

                <nav id="nav">                    

                    if ($percentage_result >= 70) {

                        echo   "<a href='notifications.php' class='iconText notofication_display_red' id='notofication_display'><i class='bx bxs-bell menuIcon'></i><span class='menu_group'>Notifications</span></a>";
                    } else {
                        echo "<a href='notifications.php' class='iconText class='bx bxs-bell menuIcon'></i><span class='menu_csoport'>Notifications</span></a>";
                    }
                    ?>

                </nav>

    <!--=============== script ===============-->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="../js/notifications.js"></script>
   
</body>

notifications.js:

window.addEventListener('load', () => {

    const activeStite = window.location.pathname;        
    if (activeStite === "/example/php/notifications.php") {
        var indicator = document.getElementById("notofication_display");
        indicator.classList.remove("notofication_display_red");
        indicator.classList.add("notofication_display_white");
    }

});

menu.css:

.notofication_display_red {
    color: red;    
}

.notofication_display_white {
    color: white;
}

How I calculated the 70 or 80 percent, I didn’t write that down because it’s not relevant to my current problem.
I hope I have made myself clear and if I get a reply then thank you very much.