title: how can I hide tail triangle on popup
body: <p><a href="http://pasteio.com/m26f642c81452a5bf67cfc5f0b0f2390c" rel="noreferrer">image http://pasteio.com/m26f642c81452a5bf67cfc5f0b0f2390c</a></p>
  
  <p>I'm using leaflet to render the mapbox map. There is small triangle on the top of marker; how can I hide it?</p>