diff --git a/Page Sizer/Code.js b/Page Sizer/Code.js
index 24cc406..718d327 100644
--- a/Page Sizer/Code.js	
+++ b/Page Sizer/Code.js	
@@ -13,8 +13,9 @@ function showDialog() {
   var dialog = (
     HtmlService.createTemplateFromFile('Dialog')
       .evaluate()
-      .setWidth(250)
-      .setHeight(145)
+      .setWidth(280)
+      .setHeight(160)
+      .setSandboxMode(HtmlService.SandboxMode.IFRAME)
   );
 
   DocumentApp.getUi().showModalDialog(dialog, 'Custom page size');