Change Header Font Color?

I want my theme to stay exactly as I have it, but I want to change the text color in the header (and mobile tab extension)

Could someone help with this? I’m sure it’s just a CSS snippet, but I don’t know what.

For your links, use this one: This will make it the same regardless of light or dark mode

    .App-header, .App-header a {
        color: #ffffff !important;
    }

For the signup buttons you can use

.Button-label {
    color: white !important;
}