app/src/commons/component/nic-dropdown.component.scss

#nic-list-border .ui-widget-content {
  border: 0px;
}

#nic-list-border .ui-listbox .ui-listbox-list {
  line-height: 2em;
}
#nic-list-border .ui-listbox .ui-listbox-item {
  padding: 0.5em;
}