diff --git a/assets/css/040_content.css b/assets/css/040_content.css
index 3290f43..e49539b 100644
--- a/assets/css/040_content.css
+++ b/assets/css/040_content.css
@@ -14,6 +14,7 @@
   blockquote,
   dl,
   h1, h2, h3, h4, h5, h6,
+  header,
   hr,
   nav,
   ol,