Ciao @aldeavfx,
I noticed that in posts the black color of the header text is hiding with the background. But there is a trick for this:
The “page observer” adds the class “.top” to body when you are at the top of the page, so if you want to change text color when the header in at the top of the page you can use
body.top #masthead a, /* menu links */
body.top #masthead h1 a, /* website headline */
body.top #masthead p /* website subtitle */
{
color: var(--wp--preset--color--white) !important;
}
Alternatively you could set the header background color on white and use “customizer>modul-r options>header>Transparent Header”. In this way the white background will be visible only below the posts header (but not in homepage or categories where the background is yet white)