title: Moving vertical scroll bar on keyboard navigation in custom div dropdown
body: <p>I am navigating through the options in a dropdown( simulated using div) using the keyboard navigation(up, down and enter keys). I want the scroll bar to move and adjust to show the option properly as i navigate using keyboard. </p>
  
  <p>If anyone can give in their insight, It will be helpful, much appreciated.</p>
  
  <p>I have to use pure Javascript, no Jquery can be used.</p>