ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>


<script src="https://code.highcharts.com/highcharts.js"></script>

<div id="container" style="height: 400px"></div>

CSS

.highcharts-html-tooltip {
    border: 1px solid;
    background: #592400;
    display: block;
    padding: 1px !important;
    width: 5px;
    whitespace: normal
}

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    
    tooltip: {
        formatter: function(){
            return 'Bar 2, 1/16-3 Tuplet Note';
        },
        useHTML: true,
        backgroundColor: '#038530',
        borderWidth: 0,
        shadow: false
    },
    
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    
    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]        
    }]
}, function(chart){

    chart.container.lastChild.className = 'highcharts-html-tooltip';
    
});