scinote-web/app/assets/stylesheets/shared_styles/elements/bootstrap_tabs.scss

.sci-nav-tabs {
  border-bottom: $border-default;
  display: flex;

  a {
    color: $color-volcano;
    padding: .5em;
    position: relative;

    &:hover {
      text-decoration: none;
    }

    &.active {
      color: initial;

      &::after {
        content: '';
        background: $brand-primary;
        bottom: 0;
        height: .25em;
        left: 0;
        position:absolute;
        width: 100%;
      }
    }
  }
}