diff --git a/modules/editor/skins/ckeditor/css/default.less b/modules/editor/skins/ckeditor/css/default.less
index 2ee58cfa3..7bd59c3ef 100644
--- a/modules/editor/skins/ckeditor/css/default.less
+++ b/modules/editor/skins/ckeditor/css/default.less
@@ -53,6 +53,7 @@ html {
 	}
 	body.cke_editable {
 		min-height: 100vh;
+		box-sizing: border-box;
 		padding: 10px;
 		.light_dark(@colorset);
 	}