openaire-theme/less/slider.less

.hook-slider-misc() {
  .uk-slider-container-tabs:extend(.uk-slider-container) {
    position: relative;

    & .uk-tab {
      margin-left: -@tab-margin-horizontal;
    }

    &::before {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      border-bottom: @tab-border-width solid @tab-border;
    }
  }
}