example_component_css.md

/*
 * Custom Datetime Calendar Header Parts
 * -------------------------------------------
 */
ion-datetime::part(calendar-header) {
  background-color: orange;
}

ion-datetime::part(month-year-button) {
  background-color: lightblue;
}

ion-datetime::part(prev-next-buttons) {
  background-color: firebrick;
}

ion-datetime::part(prev-button) {
  color: white;
}

ion-datetime::part(next-button) {
  color: black;
}

ion-datetime::part(days-of-week) {
  background-color: #9ad162;
  color: white;
}