How to fix transparent VS Code context menu on web?

I use VS Code Server as a Home Assistant integration, but I think, as it is based on VS Code Web, there should be no difference. I have just installed it, and right from the beginning, the context menu looks transparent. I can't imagine this would be helpful for someone. Is this a weird setting or extension, like in this thread?:

How to fix VS Code displaying as see-through or transparent?

Or do you think it is a Home Assistant-related bug?

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I looked up the GlassIt-VSC extension but it is uninstalled.