[Solved]-Column based Highchart drilldown series assign color code to each column-Highcharts

you forgot to set the zones.value documentation

        zones: [{
            color: '#ffcc00',
            value:5
        }, {
            color: '#aa7f39',
            value:12
        }, {
            color: '#ff8000'
        }, {
            color: '#ffff00'
        }]

updadted fiddle