diff --git a/agaric/templates/layout/page.html.twig b/agaric/templates/layout/page.html.twig
index 4fc4623..9ae8197 100644
--- a/agaric/templates/layout/page.html.twig
+++ b/agaric/templates/layout/page.html.twig
@@ -35,10 +35,13 @@
 {% endif %}
 {% endblock navbar %}
 
-{% set header_section_attributes = create_attribute() %}
+{% set header_section_attributes = create_attribute({'class': ['hero', 'is-dark']) %}
+{% if false %}
+  {% set header_section_attributes = header_section_attributes.removeClass('is-dark').setAttribute('data-headerbg', 'light') %}
+{% endif %}
 
 {% block header %}
-<section{{ header_section_attributes.addClass(['hero', 'is-dark']) }}>
+<section{{ header_section_attributes }}>
   {% block header_and_search %}
   {% if page.header or page.header_search %}
   {# Header hero region + search #}