<% product_name ||= nil environment ||= nil full_width ||= false search ||= false search_left ||= false navigation_items ||= [] remove_bottom_border ||= false search_left ||= false width_class = full_width ? "govuk-header__container--full-width" : "govuk-width-container" header_classes = %w(gem-c-layout-header govuk-header) header_classes << "gem-c-layout-header--#{environment}" if environment header_classes << "gem-c-layout-header--no-bottom-border" if remove_bottom_border header_classes << "gem-c-layout-header--search-left" if search_left %>