score:20

Accepted answer

Update pointPadding :0.2 to pointPadding :0 in

plotOptions: {
                column: {
                    pointPadding: 0,
                    borderWidth: 0
                }
            },

score:4

chart: {
    marginBottom: 1,
    marginLeft: 0,
    marginRight: 0,
    marginTop: 0,
    renderTo: container,
    type: 'column',
},

DEMO

Also check GroupPadding and PointPadding


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