AdminLTE/build/scss/plugins/_daterangepicker.scss

@include dark-mode() {
  .daterangepicker {
    background-color: lighten($dark, 5%);
    border: inherit;

    &::before,
    &::after {
      border-bottom-color: lighten($dark, 5%);
    }

    td.available:hover,
    th.available:hover {
      background-color: lighten($dark, 5%);
    }
    td.in-range {
      background-color: lighten($dark, 10%);
      color: $white;
    }

    td.off,
    td.off.in-range,
    td.off.start-date,
    td.off.end-date {
      background-color: darken($dark, 5%);
      color: $white;
    }

    .ranges li:hover {
      background-color: $dark;
    }

    &.show-ranges.ltr .drp-calendar {
      border-color: lighten($dark, 10%);

      &.left,
      &.right {
        border-color: lighten($dark, 10%);
        padding-top: 0;
      }
    }

    .drp-buttons {
      border-color: lighten($dark, 10%);
    }

    .calendar-table {
      background-color: $dark;
      border-color: lighten($dark, 10%);

      th,
      td {
        color: $white;
      }

      .next span,
      .prev span {
        border-color: $white;
      }
    }

    select.hourselect,
    select.minuteselect,
    select.secondselect,
    select.ampmselect {
      background-color: $dark;
      border-color: lighten($dark, 10%);
    }
  }
}