diff --git a/agaric/templates/field/field-group-html-element--group-card-content.html.twig b/agaric/templates/field/field-group-html-element--group-card-content.html.twig
new file mode 100644
index 0000000..3c1fd9c
--- /dev/null
+++ b/agaric/templates/field/field-group-html-element--group-card-content.html.twig
@@ -0,0 +1,2 @@
+{% extends "field-group-html-element.html.twig" %}
+{% set attributes = attributes.addClass('card-content content') %}