diff --git a/dev.css b/dev.css
index 80361e1..fb06aed 100644
--- a/dev.css
+++ b/dev.css
@@ -122,6 +122,7 @@ fieldset,
 figure,
 footer,
 form,
+header,
 hr,
 input,
 iframe,
@@ -284,7 +285,7 @@ aside h3 {
 
 header {
 	padding: 1rem calc(50vw - 50%);
-	margin: 0 calc(50% - 50vw) 0;
+	margin: 0rem calc(50% - 50vw) 1rem;
 }
 
 header * {