antd-mobile/es/components/calendar/calendar.css

<div align="center">

.adm-calendar .adm-calendar-header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding-top: 4px;
}
.adm-calendar .adm-calendar-header a.adm-calendar-arrow-button {
  padding: 4px 8px;
  display: block;
  flex: none;
}
.adm-calendar .adm-calendar-header a.adm-calendar-arrow-button svg {
  height: 22px;
}
.adm-calendar .adm-calendar-header a.adm-calendar-arrow-button.adm-calendar-arrow-button-right svg {
  transform: rotate(180deg);
}
.adm-calendar .adm-calendar-header .adm-calendar-title {
  font-size: var(--adm-font-size-10);
  flex: auto;
  text-align: center;
}
.adm-calendar .adm-calendar-body {
  display: flex;
  flex-wrap: wrap;
}
.adm-calendar-cells {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: stretch;
  padding: 8px 8px 4px;
}
.adm-calendar-cell {
  flex: none;
  box-sizing: border-box;
  width: calc(100% / 7);
  height: 48px;
  margin-bottom: 4px;
  padding: 2px;
  color: var(--adm-color-text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
}
.adm-calendar-cell.adm-calendar-cell-today {
  color: var(--adm-color-primary);
}
.adm-calendar-cell.adm-calendar-cell-disabled {
  color: var(--adm-color-light);
}
.adm-calendar-cell.adm-calendar-cell-disabled .adm-calendar-cell-bottom {
  color: var(--adm-color-light);
}
.adm-calendar-cell.adm-calendar-cell-selected.adm-calendar-cell.adm-calendar-cell-selected {
  background: var(--adm-color-primary);
  color: var(--adm-color-white);
}
.adm-calendar-cell.adm-calendar-cell-selected .adm-calendar-cell-bottom {
  color: var(--adm-color-white);
}
.adm-calendar-cell.adm-calendar-cell-selected.adm-calendar-cell.adm-calendar-cell-selected-begin {
  border-top-left-radius: 4px;
  border-bottom-left-radius: 4px;
}
.adm-calendar-cell.adm-calendar-cell-selected.adm-calendar-cell.adm-calendar-cell-selected-end {
  border-top-right-radius: 4px;
  border-bottom-right-radius: 4px;
}
.adm-calendar-cell.adm-calendar-cell-disabled.adm-calendar-cell.adm-calendar-cell-selected {
  color: var(--adm-color-light);
}
.adm-calendar-cell .adm-calendar-cell-top {
  flex: none;
  font-size: var(--adm-font-size-10);
}
.adm-calendar-cell .adm-calendar-cell-bottom {
  flex: none;
  font-size: var(--adm-font-size-4);
  height: 12px;
  line-height: 12px;
  color: var(--adm-color-weak);
}
.adm-calendar-mark {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  border-bottom: solid 1px var(--adm-color-border);
  height: 45px;
  box-sizing: border-box;
  font-size: var(--adm-font-size-7);
  padding: 0 8px;
}
.adm-calendar-mark .adm-calendar-mark-cell {
  flex: 1;
  text-align: center;
}