@media (max-width: 400px) {
   .flatpickr-calendar.animate.showTimeInput.rightMost.arrowBottom.open,
   .flatpickr-calendar.animate.showTimeInput.arrowTop.open.rightMost {
      right: 50% !important;
      transform: translateX(50%) !important;
   }
   .flatpickr-calendar.rightMost:before,
   .flatpickr-calendar.rightMost:after {
      right: 50% !important;
      transform: translateX(50%) !important;
   }
}