Merge pull request #892 from HelixDesignSystem/patch-docs-header

chore(docs): tweak docs `header`

Author: 100stacks

docs/_layout.scss

@@ -11,7 +11,7 @@ body.hxVertical {
     }
 
     > header {
-      background-color: $gray-50;
+      background-color: $gray-100;
       border-color: $gray-100;
       border-style: solid;
       border-width: 0 0 1px;