Issue Summary

All of these popups had transparent backgrounds (see attachment) as it has 100% width+height but use a 2% margin so the user can still see the Confluence editor behind the dialog.

Now those backgrounds are all white (see attachment).
Setting width/height to less than 100% results in a dialog chrome/header.
The culprit is the CSS for .aui.dialog2.content

Steps to Reproduce

1. Install this app from Marketplace: https://marketplace.atlassian.com/apps/1228582/content-tag-cloud-for-confluence?hosting=cloud&tab=overview
2. Create a new page in Confluence
3. Use the /tag cloud+ and see the background of the popup.

Expected Results

The background of the popup should be transparent.

Actual Results

The background of the popup is white.

Workaround

Currently, there is no known workaround for this behaviour.