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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