Fixed sizing issue in Image Viewer

[veler]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• New feature or enhancement
• UI change (please include screenshot!)
• Code style update (formatting, renaming)
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What is the current behavior?

Issue Number: fix #1412

What is the new behavior?

Fixed the CSS.

Other information

Tested on Windows (Chromium), Linux and MacOS (WebKit).

Recording.2024-10-27.113049.1.mp4

Quality check

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• Did you follow the code style guideline as described in CONTRIBUTING.md
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• If necessary and if possible, did you verify your changes on:
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  • macOS
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