All you need to do is adding a few simple Lines of CSS to let the Icons you have added into the Accordion Header rotate with the active/inactive state.
.wcd_accordion_header i {
transition: all 0.4s ease-out;
}
.wcd_accordion_active i {
transform: rotate(180deg);
}
You could expand that to every other element you would like to target. Just make sure to add .wcd_accordion_active
to your selector to target the active state (expanded) state of the accordion!