title: How do I change the default background color of notistack in MUI v5?
body: <p>The default background color is white, but I'd like to change it to a dark color.</p>
  <p>Dark mode is enabled in mui v5.</p>
  <p>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.</p>
  <pre class="lang-js prettyprint-override"><code>// _app.tsx
  &lt;SnackbarProvider maxSnack={3}&gt;
    &lt;Component {...pageProps} /&gt;
  &lt;/SnackbarProvider&gt;
  </code></pre>
  <p>This is how notistack is implemented.</p>