You can customize points by initializing the point colors. The customization options allow you to differentiate the
negative points. This customization only applicable for line, column and area type Sparkline.
ReactDOM.render( <EJ.Sparkline id="sparkline1" negativePointColor = "red" highPointColor = "blue" lowPointColor = "orange" startPointColor = "green" endPointColor = "green" ></EJ.Sparkline>, document.getElementById('sparkline') );