Is there an existing issue for this?

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Description of the Issue

when you're opening a CSS with [color-scheme]
the word color-scheme doesn't get the syntax text coloration

Steps To Reproduce

1. Create a css file
2. try something like
3. #blazor-error-ui {
   color-scheme: light only;
   }

Current Behavior

n/a

Expected Behavior

proper syntax coloration

Debug Information

n/a

Anything else?

No response