What is the DOM property name for Chart Overlay line?

[sandeeprachuri]

Chart overlay line default color is "yellow". But, I am trying to see it in red color.

Tried this with different DOM properties in my CSS:

g.highcharts-tracker stroke {
fill: blue !important;
}

g.highcharts-markers.highcharts-tracker {
stroke: 0xFF0000 !important;
}

g.highcharts-marker {
stroke: 0xFF0000 !important;
}

But none of them has worked.

Does anybody have the idea to achieve this?

Thanks,
Sandeep