title: nvd3 angularjs fixed tooltip
body: <p>I'm trying to fix the graph but the tooltip is not fixed and have strange behavior where the tooltip start to float around the window. </p>
  
  <p>I have tried to put in the nvd3.css the position fixed but didn't work:</p>
  
  <pre><code>.nvtooltip {
      **position: fixed;**
      background-color: rgba(255,255,255,1.0);
      padding: 1px;
      border: 1px solid rgba(0,0,0,.2);
      z-index: 10000;
      font-family: Arial;
      font-size: 13px;
      text-align: left;
      pointer-events: none;
      white-space: nowrap;
      -webkit-touch-callout: none;
      -webkit-user-select: none;
      -khtml-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
  }
  </code></pre>
  
  <p>Any advice?</p>