title: set highchart margin
body: <p>I have built some highcharts charts and I am displaying them one at a time
  on mouseover. 
  The jquery creates a floating div (depending on the cursor) with a border line </p>
  
  <pre><code>1px solid black
  </code></pre>
  
  <p>and then the highchart method is being called to draw the chart. </p>
  
  <p>The thing is that highcharts exceed the boundary and left and bottom border is not shown. </p>
  
  <p>I tried 'margin' :</p>
  
  <pre><code>chart:
      {
        renderTo: 'graph',
        defaultSeriesType: 'line',
        zoomType: 'x',
        margin: [ 10, 10, 10, 10]
      },
  </code></pre>
  
  <p>and still it does the same thing. </p>