ant-design/style/components/datepicker.less

@prefixCalendarClass: ant-calendar;

.@{prefixCalendarClass} {
  box-sizing: border-box;
  * {
    box-sizing: border-box;
  }
}

@import "datepicker/Picker";
@import "datepicker/Calendar";
@import "datepicker/Time";
@import "datepicker/TimePanel";
@import "datepicker/MonthPanel";
@import "datepicker/YearPanel";
@import "datepicker/DecadePanel";