app/node_modules/ng-zorro-antd/date-picker/style/WeekPicker.less

.@{calendar-prefix-cls}-week-number {
  &-cell {
    opacity: 0.5;
  }
  .@{calendar-prefix-cls}-body tr {
    cursor: pointer;
    transition: all 0.3s;

    &:hover {
      background: @primary-1;
    }
    &.@{calendar-prefix-cls}-active-week {
      font-weight: bold;
      background: @primary-2;
    }
    .@{calendar-prefix-cls}-selected-day .@{calendar-prefix-cls}-date,
    .@{calendar-prefix-cls}-selected-day:hover .@{calendar-prefix-cls}-date {
      color: @text-color;
      background: transparent;
    }
  }
}