Unable to define colors for each Measure in Waterfall chart

My requirement is to create a waterfall chart with conditional formatting like green color for Positive and red color for negative measures(with bex Query as DataSource). I have used the conditional formatting in the properties tab and appied css (g.v-m-main g.v-m-plot g.v-column:nth-child(1) .v-datapoint.v-morphable-datapoint {fill: red;}) but still the color is not changing. But for column chart they are working. Please suggest me where I made mistake.

Thanks & Regards

Rajesh R