diff --git a/core/modules/ckeditor/css/ckeditor-iframe.css b/core/modules/ckeditor/css/ckeditor-iframe.css
index 994d1d55e53b899e702f6c1c6ff06907f1070f6a..38ada3a0fa6b5554a19bbd7089a06a7177a40b5a 100644
--- a/core/modules/ckeditor/css/ckeditor-iframe.css
+++ b/core/modules/ckeditor/css/ckeditor-iframe.css
@@ -3,7 +3,7 @@
  */
 body {
   font-family: Arial, Verdana, sans-serif;
-  font-size: 12px;
+  font-size: 15px;
   color: #222;
   background-color: #fff;
   margin: 8px;