AdminLTE/build/scss/mixins/_cards.scss

//
// Mixins: Cards Variant
//

@mixin cards-variant($name, $color) {
  .card-#{$name} {
    &:not(.card-outline) {
      > .card-header {
        background-color: $color;

        &,
        a {
          color: color-yiq($color);
        }

        a.active {
          color: color-yiq($white);
        }
      }
    }

    &.card-outline {
      border-top: 3px solid $color;
    }

    &.card-outline-tabs {
      > .card-header {
        a:hover{
          border-top: 3px solid $nav-tabs-border-color;
        }
        a.active,
        a.active:hover{
          border-top: 3px solid $color;
        }
      }
    }
  }

  .bg-#{$name},
  .bg-gradient-#{$name},
  .card-#{$name}:not(.card-outline) {
    > .card-header {
      .btn-tool {
        color: rgba(color-yiq($color), .8);

        &:hover {
          color: color-yiq($color);
        }
      }
    }
  }

  .card.bg-#{$name},
  .card.bg-gradient-#{$name} {
    .bootstrap-datetimepicker-widget {
      .table td,
      .table th {
        border: none;
      }

      table thead tr:first-child th:hover,
      table td.day:hover,
      table td.hour:hover,
      table td.minute:hover,
      table td.second:hover {
        background-color: darken($color, 8%);
        color: color-yiq($color);
      }

      table td.today::before {
        border-bottom-color: color-yiq($color);
      }

      table td.active,
      table td.active:hover {
        background-color: lighten($color, 10%);
        color: color-yiq($color);
      }
    }
  }
}