Custom CSS that worked fine in ThingWorx 9.2 is no longer working in ThingWorx 9.6
I am using a Custom css code in mashup for a dropdown which is
.widget-ptcsdropdown::part(item-value) {
color: white;
}
code working fine in thingworx version 9.2 but recently thingworx upgread to 9.6 version and same css code using in a mashup and it is not working.
So please give some suggestion on it.

