paper-gtk-theme/Paper/gtk-3.0/apps/_archive-manager.scss

/*******************
 * Archive Manager *
 *******************/

$archive_manager: #A88A67;

FrWindow {
  .titlebar,
  .header-bar,
  .toolbar  {
    background-color: $archive_manager;

    &:backdrop {
      background-color: darken($archive_manager,10%);
    }
  }
}