title: how to change the icon of zoom-contorls in Openlayers 3?
body: <p>I want to change the default zoom-in / zoom-out icons to something like in the Cirlce. Sorry I can't post the picture here so I can't show you guys the image.</p>
  
  <p>Can anyone sugguest me how to achieve this?</p>
  
  <p>AJ</p>