diff --git a/app/views/layouts/example.html.slim b/app/views/layouts/example.html.slim
index 46c9971..242968a 100644
--- a/app/views/layouts/example.html.slim
+++ b/app/views/layouts/example.html.slim
@@ -5,7 +5,8 @@ head
     body { margin: 20px }
     .content {
       background-color: #ddd;
-      padding: 20px
+      padding: 20px;
+      width: #{params[:width] || 960}px;
     }
     p { font-family: serif; font-size: 16px }
 body