diff --git a/modules/message/skins/simple_world/common_header.html b/modules/message/skins/simple_world/common_header.html
index a01471629..e92d2b510 100644
--- a/modules/message/skins/simple_world/common_header.html
+++ b/modules/message/skins/simple_world/common_header.html
@@ -1,3 +1,6 @@
+<!--// responsible layout -->
+{Context::addMetaTag("viewport", "width=device-width, user-scalable=yes")}
+
 <!--// Check layout. If it is Simple World, select layout primary colors as a primary color of this skin -->
 {@
 	$material_colors = array(