Can you talk a bit more about what you’re doing with classNames here?
Sherwood Callaway

It allow you to use the default className you declared in your component, but also allows you to add more classNames to your components when composing:

In this case your class will have only the ‘App’ CSS class.

<App />

In this case your app has two CSS classes:

<App className="Custom-App-Theme" />
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