Remove gap between series in stacked column chart

Question

Is there a way to remove the small white line (gap) between series in a stacked column chart when using Highcharts? See the link below for further understanding.

The stacked column chart with gaps pointed out

I have looked into different kinds of padding and other methods but not found anything that works.

Thank you for looking into this :)

Answer 1

It is a border, so only what you need is set borderWidth as 0.