title: Hide Material UI grid column on certain breakpoints
body: <p>I'm trying to hide some columns on certain breakpoints, like this:</p>
  <pre><code>&lt;Grid container&gt;
    &lt;Grid item sm={1} md={0} /&gt;
    &lt;Grid item sm={10} md={12}&gt;
      {/* some content goes here */}
    &lt;/Grid&gt;
    &lt;Grid item sm={1} md={0} /&gt;
  &lt;/Grid&gt;
  </code></pre>
  <p>So in this example first and last columns should not show on medium breakpoint and bigger. I wrote <code>md={0}</code>, but that's not a correct code.
  Does anyone know the correct way of doing that?</p>