title: How to show gridlines only on 0 on the yAxis in highcharts?
body: <p>I have a highcharts graph and everything is going on as the mockup below. But there are a few things I am stuck on. Is there a way to remove all the gridlines from the yAxis except for the one in 0 like the one shown in the picture below with highcharts? Or do we have to use our own javascript to accomplish that? Also, can we show the grey colored areas like that one between the yAxis label and the graph and the one in the right side of the graph (end of the graph) ? </p>
  
  <p><img src="https://i.stack.imgur.com/wVSqD.jpg" alt="graph mockup"></p>
  
  <p>Thanks For any suggestions.</p>