Theme Quick Settings doesn't change Header!

Hello! How can I permanently define the Header color available in the "Theme Quick Settings" block? After setting it up, when I browser refresh Header 1 is always reloaded.

This feature doesn't work in fresh, profile and full installations. So, why is the "Theme Quick Settings" block there for?

Hello

Theme Quick Settings is only use for demo. If you want to change permanently. Go to admin theme settings and input class header-color  or hearder-dark into Custom HTML class text field.

Thank you.