Highcharts test tool

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container"></div>

CSS

#container {
    min-width: 300px;
    max-width: 800px;
    height: 300px;
    margin: 1em auto;
}

JavaScript

var color = Highcharts.Color(Highcharts.getOptions().colors[0]).brighten(0.1),
    rgba = color.rgba;



console.log('#' + rgba[0].toString(16) + rgba[1].toString(16) + rgba[2].toString(16));