.fc-day-sat { color:#6F6FFF; }     /* 토요일 */
.fc-day-sun { color:#FF6F6F }    /* 일요일 */
.fullcalendar.fc .fc-daygrid-day-number {
    cursor: default;
}
.fullcalendar.fc .fc-daygrid-day-number.fc-day-number-sat { color:#6F6FFF; }     /* 토요일 */
.fullcalendar.fc .fc-daygrid-day-number.fc-day-number-sun,
.fullcalendar.fc .fc-daygrid-day-number.fc-day-number-holiday { color:#FF6F6F }    /* 일요일 */