When you will open your IDE site, you may see that all the theming is missing from the site.
This issue happens because the IDE uses https and the resources(CSS & JS) are called using http. To resolve this issue, you need to remove the https from the IDE URL and load it with http. Changing the Web IDE address to http://... (removing the s) will solve this.
This issue is occurring with Drupal 7 sites only because of mixed content issue, detailed information regarding this is available here https://www.drupal.org/https-information
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