Lack of contrast between headerbar and content

[SilverMarcs]

Currently, the light theme has one uniform color throughout headerbar and body content and this causes contrast issues.

The headerbar should look better with an ever so slightly darker color, similar to colloid dark variant. Perhaps inspiration can be taken from the new libadwaita redesign. For reference:

Edit: I would like to suggest the same thing for sidebars such as in nautilus. Im aware that the colors are slightly darker already but on normal monitor birghtness it does not make a difference. So it should be more darker