diff --git a/wagtail/admin/rich_text/editors/hallo.py b/wagtail/admin/rich_text/editors/hallo.py
index 2ffb6fd1a..47fdd24b7 100644
--- a/wagtail/admin/rich_text/editors/hallo.py
+++ b/wagtail/admin/rich_text/editors/hallo.py
@@ -133,7 +133,9 @@ class HalloRichTextArea(WidgetWithScript, widgets.Textarea):
         media = Media(js=[
             'wagtailadmin/js/vendor/hallo.js',
             'wagtailadmin/js/hallo-bootstrap.js',
-        ])
+        ], css={
+            'all': ['wagtailadmin/css/panels/rich-text.css']
+        })
 
         for plugin in self.plugins:
             media += plugin.media
diff --git a/wagtail/admin/templates/wagtailadmin/pages/_editor_css.html b/wagtail/admin/templates/wagtailadmin/pages/_editor_css.html
index 2de738b9a..46f680c4c 100644
--- a/wagtail/admin/templates/wagtailadmin/pages/_editor_css.html
+++ b/wagtail/admin/templates/wagtailadmin/pages/_editor_css.html
@@ -4,8 +4,7 @@
     CSS declarations to be included on the 'create page' and 'edit page' views
 {% endcomment %}
 
-<link rel="stylesheet" href="{% static 'wagtailadmin/css/layouts/page-editor.css' %}" type="text/css" />
-<link rel="stylesheet" href="{% static 'wagtailadmin/css/panels/rich-text.css' %}" type="text/css" />
+<link rel="stylesheet" href="{% static 'wagtailadmin/css/layouts/page-editor.css' %}" />
 
 {% hook_output 'insert_editor_css' %}