Change color of .menu-toggle

Hi!

I have somehow managed to make the menu text color in the mobile version of my website almost as dark as the background and I don’t know how to fix it ??

Here is a link to the website:

https://tekniskfysik.org/

If you decrease the width of the browser until it turns into mobile view you will see that the color goes dark grey.

I’ve tried inspecting it and found this code:

@media (max-width: 643px)
.menu-toggle, .menu-toggle:hover, .menu-toggle:focus, .menu-toggle:active {
    background: none;
    border: none;
    color: #141412;
    padding: 12px 0 12px 20px;
}

If I change the color here, the color of the menu changes.

But how can I change it permanently?