# in IDE:
* open `/themes/advanced/platform/inc/styles.css` file for editing
* add `background-color: red !important;` to the end of 1st declaration (the `html, body`) in that file and save changes
# in Admin Console
* go to {nav Website & Content > Browse Website} section
* click on `Content Mode` button in top frame
* click on orange `Edit Content` button to edit a content block
* confirm, that CKEditor background (that opened in new window) is red
* close CKEditor popup/modal window
* go to {nav Website & Content > Structure & Data} section
* open any category for editing
* click on document icon below `Description` field name
* confirm, that CKEditor background (that opened in new window) is red
* close CKEditor popup/modal window