Color issues | WordPress.org

Your individual style is still available, but it is only loaded after the style of the theme. Due to an unfavorable selector, the grey coloring of the background is no longer visible.

You would have to do the following to solve this:
Go to Appearance > Customizer > Additional CSS. This is the place you were looking for 😉
There you should see your individual style, currently e.g. this one here:

.site {
background-color: #444444;
}

Change that to

body .site {
background-color: #444;
}

After saving, the background color should be visible again.

Thanks man, you’re a life saver – that did the trick.

Now I have to readjust text and the link colors. Any hint where to do that?

Also add body in front of it, which increases the value for the properties. For example:

body .main-navigation li a {
 color: #dddddd;
}

Thanks again, seems I got it right for now.