admin/src/scss/5-vendor/_flatpickr.scss

$flatpickr-tile-height: 45px;

.flatpickr-calendar.inline {
  background: transparent;
  box-shadow: none;
  width: 100%;
  
  .flatpickr-days {
    width: 100%;
  }

  .dayContainer {
    width: 100%;
    min-width: 100%;
    max-width: 100%;
  }

  .flatpickr-day {
    border-radius: $border-radius;
    max-width: inherit;
    height: $flatpickr-tile-height;
    line-height: $flatpickr-tile-height;

    &.today {
      border: 0;

      &:before {
        content: "";
        display: inline-block;
        border-color: rgba(0,0,0,.2) transparent $primary;
        border-style: solid;
        border-width: 0 0 7px 7px;
        position: absolute;
        bottom: 4px;
        right: 4px;
      }

      &.selected:before {
        border-color: rgba(0,0,0,.2) transparent $white;
      }

      &:hover {
        background: #e6e6e6;
        color: $black;
      }
    }

    &.selected {
      &,
      &:hover,
      &:focus {
        border-radius: $border-radius;
        background: $primary;
        color: $white;
      }
    }
  }

  .flatpickr-weekdays {
    height: $flatpickr-tile-height;
  }
  .flatpickr-weekday {
    height: $flatpickr-tile-height;
    line-height: $flatpickr-tile-height;
  }

  .flatpickr-months {
    .flatpickr-month {
      height: $flatpickr-tile-height;
    }

    .flatpickr-prev-month,
    .flatpickr-next-month {
      height: $flatpickr-tile-height;
    }
  }

  .flatpickr-current-month {
    padding-top: 0;
    line-height: $flatpickr-tile-height;
    height: $flatpickr-tile-height;

    .flatpickr-monthDropdown-months {
      appearance: none;
    }
    
    .flatpickr-monthDropdown-months,
    input.cur-year {
      font-weight: $font-weight-normal;
      font-size: $h4-font-size;
    }
  }

  .flatpickr-prev-month,
  .flatpickr-next-month {
    width: 45px;
    border-radius: $border-radius;

    &:hover {
      background: #e6e6e6;
      color: $black;
    }
  }
}