[Solved]-Highcharts -- Can't apply style to x axis labels-Highcharts

yAxis: [{
        gridLineColor: '#ebebeb',
        lineColor: '#ebebeb',
        minorGridLineColor: '#ebebeb',
        tickColor: '#ebebeb',
        plotLines: [{
            color: '#ebebeb'
        }],
        labels: {
            style: {
                color: '#525151',
                font: '12px Helvetica',
                fontWeight: 'bold'
            },
            formatter: function () {
                return this.value;
            }
        },
        title: {
            text: null
        }
    }]

Note the extra [] around the braces for yAxis. Not required for x. As yAxis could have a second y axis.