title: Ionic 4: how to hide ScrollBar in ion-content
body: <p>I'm trying to hide the scroll-bar in ion-content (Ionic 4)
  there's no ion-scroll on ionic 4 so I used the ion-content
  but I can't find any css attribute to hide it (most of them not work)</p>
  <p><em>I do want to scroll but I don't want to see the scrollbar</em></p>
  <pre><code>::-webkit-scrollbar,
  *::-webkit-scrollbar {
    display: none;
  }
  </code></pre>
  <p>I've tried it but it doesn't work in ion-content.</p>