title: Using datamaps, I am trying to create a map with not 100% opacity
body: <p>I'm using datamaps (<a href="http://datamaps.github.io/" rel="nofollow noreferrer">http://datamaps.github.io/</a>) and trying to make the map transparent. I cannot find a built in feature for fillOpacity for the countries, only for the bubbles. </p>
  
  <p>Since this is built on top of D3 I was wondering if there is a hacky workaround to achieve my goal. Eventually I'll probably switch over to D3 for the control.</p>