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Sorry to hear you’re facing problems 
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The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
0. Activate dark mode in nextcloud
- Activate dark mode on chrome
- Open nextcloude instance
- Try to open system menues
There is nothing wrong, except the colors on the text are close enough that you can’t read what it says.