The default background color is white, but I'd like to change it to a dark color.
Dark mode is enabled in mui v5.
I've found ways to change the error, info, etc., but what I want to do is to change the default background color without specifying any variant.
// _app.tsx
<SnackbarProvider maxSnack={3}>
<Component {...pageProps} />
</SnackbarProvider>
This is how notistack is implemented.