Venkat, Please try this:
.chartstyle g.v-m-plot g.v-modules g.v-module g g.v-datalines g.v-axis1 path.v-lines.v-morphable-line:nth-child(1) {
stroke: red !important;
}
.chartstyle g.v-m-plot g.v-modules g.v-module g g.v-datalines g.v-axis1 path.v-lines.v-morphable-line:nth-child(2) {
stroke: yellow !important;
}
.chartstyle g.v-m-plot g.v-modules g.v-module g g.v-datalines g.v-axis2 path.v-lines:nth-child(1) {
stroke: violet !important;
}
.chartstyle g.v-m-plot g.v-modules g.v-module g g.v-datalines g.v-axis2 path.v-lines:nth-child(2) {
stroke: green !important;
}
I am assuming you are already setting the CSS class property of the chart to chartstyle . Let me know if this resolves your issue.