/* カレンダーの日曜日を赤にする */
.flatpickr-calendar .flatpickr-innerContainer .flatpickr-weekdays .flatpickr-weekday:nth-child(7n+1), .flatpickr-calendar .flatpickr-innerContainer .flatpickr-days .flatpickr-day:not(.disabled):not(.flatpickr-disabled):not(.prevMonthDay):not(.nextMonthDay):nth-child(7n+1) {
    color: red;
}
/* カレンダーの土曜日を青にする */
.flatpickr-calendar .flatpickr-innerContainer .flatpickr-weekdays .flatpickr-weekday:nth-child(7), .flatpickr-calendar .flatpickr-innerContainer .flatpickr-days .flatpickr-day:not(.disabled):not(.flatpickr-disabled):not(.prevMonthDay):not(.nextMonthDay):nth-child(7n) {
    color: #25bdcf;
}
/* カレンダーの祝日を赤にする */
.flatpickr-day.is-holiday {
    background: #fcc!important;
}