title: How to change icon size on Alert in Material UI for React
body: <p>Recently Material UI has developed 'Alert' component. </p>
  
  <p>Everything is fine, excpet he fact that I don't see a way to change the icon size. </p>
  
  <p>This is my code:</p>
  
  <pre><code>&lt;Snackbar open={true}&gt;
    &lt;Alert
      className={classes.cookieAlert}
      severity="info"
      action={&lt;Button color="inherit" size="small"&gt;OK&lt;/Button&gt;}
    &gt;
      We use cookies to ensure you the best experience on our website.
    &lt;/Alert&gt;
  &lt;/Snackbar&gt;
  </code></pre>
  
  <p>And the icon is defined by 'severity', how do I change the size of that? I don't want to override the icon, just change its size to bigger. </p>