fix: display CKE notifications on the center of the page

Previously notifications were displayed too for down on the page.
This caused layout issues where the editor disappeared.

related: quiqqer/ckeditor4#30

bin/Editor.css

@@ -51,4 +51,11 @@
 }
 
 div.cke_panel.cke_combopanel.cke_ltr { width: 300px !important; }
-span.cke_rcombo span.cke_styles a span span.cke_text { width: 150px; }
\ No newline at end of file
+span.cke_rcombo span.cke_styles a span span.cke_text { width: 150px; }
+
+.cke_notifications_area {
+    position: absolute;
+    top: 50% !important;
+    left: 50% !important;
+    z-index: 999999 !important;
+}