Hello @Alexander Schlenkrich,
Welcome to Atlassian Community!
Testing on my local Confluence, I added some images to a page, most of them are dark, so it would be easier to see the white frame, but in none of them, a white frame appears.
With this said, for a better understanding of the issue, I would like to know if you can share with us a screenshot of the issue.
Is it happening with any type of image?
Is it happening to other Confluence users?
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