.bef-datepicker {
  background-image: url(/themes/custom/rapunzel/assets/datepickerIcon.svg);
  background-position: center right .75rem;
  background-repeat: no-repeat;
  background-size: 16px;      /* new: half-size icon, as requested */
  position: relative;         /* new: anchors the indicator below */
}
.bef-datepicker::-webkit-calendar-picker-indicator {
  background: transparent;
  color: transparent;
  opacity: 0;                 /* hides the native glyph, keeps it clickable */
  cursor: pointer;
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 2.5rem;
  height: 100%;
  margin: 0;
}