Subscribe pages Banner color

Hello, where can I change the black color of the public pages top banner from black to another colour ?
Thank you.

@pmcarond44 On the Settings page is a field

You can change the html and add your own styles.

Thank you duncanc, but is there no line where the color is explicitly defined. In a css file for example ?
I’m a novice to all this but find the whole most efficient.

@pmcarond44 The css for the public pages will be in the lists/styles directory.