6988 bestimmte css definitionen wieder von rem auf px umstellen

[deleonio]

The A11y and PO reviews will only take place after all other DoD steps have been completed by the Developer:

• Maturation completed and documented
• Meaningful pull request title for the release notes
• Pull request is linked to an issue
• All changes relate to the issue
• No commented out code in the final commit
• Tests to protect this code implemented (if applicable)
• Manual test performed successfully (if applicable)
• Documentation or migration has been updated (if applicable)

[github-actions]

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