[Solved]-How to change the color of a custom renderer text to the title color in Highcharts-Highcharts

You can get the color by: chart.title.styles.color. Example:

var chart = Highcharts.chart('container', {
    ...
}, function(chart) {
    chart.renderer.text('Some text', 40, 80).css({
        color: chart.title.styles.color
    }).add();
});

Live demo: http://jsfiddle.net/BlackLabel/10u2nLay/