Restoring FormatAreaStyles.css
Because the file FormatAreaStyles.css has moved to a new location, restore your original from your backup location to %TRIDION_HOME%\web\WebUI\Editors\Base\Configuration\.
Because the file FormatAreaStyles.css has moved to a new location, restore your original from your backup location to %TRIDION_HOME%\web\WebUI\Editors\Base\Configuration\.