doc-fui-ds/assets/plugins/flatpickr/dist/ie.css

Doc

span.flatpickr-weekday {
  display: inline-block;
  width: 14.2857143%;
}
span.flatpickr-day {
  width: 14.2857143%;
  margin: 0 2.491071428571428px;
}
@media screen and (min-width: 0\0) {
  div.flatpickr-current-month {
    padding-top: 0px !important;
  }
}