Can't seem to work with CSS references?

As you can see, can't see to find the “sm”rounded-lg" yet it clearly exists in my styles.css loaded by my Blazor web app.

In _Host.cshtml the reference is defined:

Web app works as expected and uses the CSS, but JB just can't seem to know what's what when it comes to CSS.
Thoughts?
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Hello!
Starting from ReSharper 2022.2, active development of productivity features for JavaScript, TypeScript, JSON, CSS, and Protobuf is suspended, and these features are disabled by default. To enable them, select the corresponding checkboxes on the Environment | Products & Features page of ReSharper options Alt+R, O: CSS Language.
Please let me know if it helps.