diff --git a/themes/vanten/assets/css/main.css b/themes/vanten/assets/css/main.css
index fed1e5c..d720058 100644
--- a/themes/vanten/assets/css/main.css
+++ b/themes/vanten/assets/css/main.css
@@ -5,7 +5,7 @@ body {
     font-size: 1.2em;
     line-height: 1.5;
     margin: 1rem;
-    max-width: 768px;
+    max-width: 43em;
     margin-right: 8em;
 }