InfoChart - Plot border visibility

Hi

I want to hide the plot border for the bubble chart done using the Infochart component. I was able to spot the svg class where it is being defined. But I could not overwrite the border property using the CSS script.

DOM explorer screenshot

CSS script

.plotborder g.v-m-plot v-background-border viz-plot-background-border

{

     stroke: #FFFFFF

     stroke-width: 0;

}

Can someone let me know how I need to refer to this class in CSS ?

Thanks