tabler/scss/vendor/_flatpickr.scss

.flatpickr-input.flatpickr-input {
  background: $input-bg;

  &.active {
    border-color: $input-focus-border-color;
    box-shadow: $input-focus-box-shadow;
  }
}

.flatpickr-calendar {
  background: $white;
  border: $input-border-width solid $input-border-color;
  border-radius: $input-border-radius;
  padding: .5rem;
  font-size: inherit;
  box-shadow: $dropdown-box-shadow;
  user-select: none;
  margin-top: -1px;

  &:before,
  &:after {
    content: none;
  }

  .flatpickr-innerContainer,
  .flatpickr-rContainer,
  .dayContainer,
  .flatpickr-days {
    width: 100%;
  }

  .dayContainer,
  .flatpickr-day {
    max-width: 100%;
    min-width: 0;
  }

  &.inline {
    width: 100%;
    box-shadow: none;
    margin: 0;
  }
}

.flatpickr-day {
  color: inherit;
  border-radius: $border-radius;
  display: flex;
  align-items: center;
  line-height: 1;

  &.flatpickr-disabled,
  &.flatpickr-disabled:hover,
  &.prevMonthDay,
  &.nextMonthDay,
  &.notAllowed,
  &.notAllowed.prevMonthDay,
  &.notAllowed.nextMonthDay {
    color: inherit;
    opacity: .2;
  }

  &.today {
    border-color: $border-color;
  }

  &.selected {
    background-color: $primary;
  }
}

span.flatpickr-weekday {
  @include subheader;
}

.flatpickr-months {
  margin-bottom: .5rem;

  .flatpickr-month {
    color: currentColor;
    fill: currentColor;
  }

  .flatpickr-current-month {
    font-weight: 400;
  }

  .flatpickr-monthDropdown-months {
    appearance: none;
    font-weight: inherit;
  }

  .flatpickr-prev-month,
  .flatpickr-next-month {
    position: static;
    color: $text-muted;

    &:hover {
      color: $body-color;
    }

    svg {
      display: block;
      fill: currentColor !important;
    }
  }

  .numInputWrapper {
    .cur-year {
      font-weight: inherit;
    }

    .arrowUp,
    .arrowDown {
      display: none;
    }
  }
}

.flatpickr-day.inRange,
.flatpickr-day.prevMonthDay.inRange,
.flatpickr-day.nextMonthDay.inRange,
.flatpickr-day.today.inRange,
.flatpickr-day.prevMonthDay.today.inRange,
.flatpickr-day.nextMonthDay.today.inRange,
.flatpickr-day:hover,
.flatpickr-day.prevMonthDay:hover,
.flatpickr-day.nextMonthDay:hover,
.flatpickr-day:focus,
.flatpickr-day.prevMonthDay:focus,
.flatpickr-day.nextMonthDay:focus {
  background: $hover-bg;
  border-color: transparent;
}