Accepted answer

you can change tooltip.crosshairs options to change the width, color, dashstyle and zindex of the line. here's the code for width and color:

tooltip: {
    crosshairs: [{
            width: 3,
            color: 'green'

the first object of the array is for the xaxis, the second for the yaxis. here's the demo.


you can use css.

  crosshairs: false

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