title: Vertical scrollbar styling not works in Firefox browser
body: <p>Code for Chrome, Opera, Safari for scrollbar as below:</p>
  <pre><code>.scroll_bar::-webkit-scrollbar {
    width: 20px;
  }
  .scroll_bar::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0px 0px 6px #0067ab;
    border-radius: 5px;
  }
  .scroll_bar::-webkit-scrollbar-thumb {
    -webkit-box-shadow: inset 0px 0px 6px #0067ab;
    border-radius: 5px;
  }
  </code></pre>
  <p>And what I should do for Firefox?</p>