title: When to use 'classes' vs 'className' with Material UI?
body: <p>I'm a little confused with the two properties. If I have,</p>
  
  <pre><code>const useStyles = makeStyles(() =&gt; ({
    style: {
      width: 600,
      height: 400,
    },
  }));
  </code></pre>
  
  <p>Then, I can do,</p>
  
  <pre><code>const classes = useStyles();
  
  &lt;SomeComponent className={classes.style} /&gt;
  </code></pre>
  
  <p>But I can also do,</p>
  
  <pre><code>const classes = useStyles();
  
  &lt;SomeComponent classes={classes} /&gt;
  </code></pre>
  
  <p>What is the difference between these two?</p>