AdminLTE/plugins/fullcalendar-daygrid/main.css

/* DayGridView
--------------------------------------------------------------------------------------------------*/
/* day row structure */
.fc-dayGridWeek-view .fc-content-skeleton,
.fc-dayGridDay-view .fc-content-skeleton {
  /* there may be week numbers in these views, so no padding-top */
  padding-bottom: 1em;
  /* ensure a space at bottom of cell for user selecting/clicking */
}

.fc-dayGrid-view .fc-body .fc-row {
  min-height: 4em;
  /* ensure that all rows are at least this tall */
}

/* a "rigid" row will take up a constant amount of height because content-skeleton is absolute */
.fc-row.fc-rigid {
  overflow: hidden;
}

.fc-row.fc-rigid .fc-content-skeleton {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
}

/* week and day number styling */
.fc-day-top.fc-other-month {
  opacity: 0.3;
}

.fc-dayGrid-view .fc-week-number,
.fc-dayGrid-view .fc-day-number {
  padding: 2px;
}

.fc-dayGrid-view th.fc-week-number,
.fc-dayGrid-view th.fc-day-number {
  padding: 0 2px;
  /* column headers can't have as much v space */
}

.fc-ltr .fc-dayGrid-view .fc-day-top .fc-day-number {
  float: right;
}

.fc-rtl .fc-dayGrid-view .fc-day-top .fc-day-number {
  float: left;
}

.fc-ltr .fc-dayGrid-view .fc-day-top .fc-week-number {
  float: left;
  border-radius: 0 0 3px 0;
}

.fc-rtl .fc-dayGrid-view .fc-day-top .fc-week-number {
  float: right;
  border-radius: 0 0 0 3px;
}

.fc-dayGrid-view .fc-day-top .fc-week-number {
  min-width: 1.5em;
  text-align: center;
  background-color: #f2f2f2;
  color: #808080;
}

/* when week/day number have own column */
.fc-dayGrid-view td.fc-week-number {
  text-align: center;
}

.fc-dayGrid-view td.fc-week-number > * {
  /* work around the way we do column resizing and ensure a minimum width */
  display: inline-block;
  min-width: 1.25em;
}