GenomeDB/mydata/themes/hardwood/build/scss/_navs.scss

ul.tabs {
  @extend .nav;
  @extend .nav-pills;
  margin-bottom: 1rem;
  border: 1px solid $card-border-color;
  padding: .5rem;
  border-radius: $card-border-radius;
  > li {
    @extend .nav-item;
    > a {
      @extend .nav-link;
      padding: .5em .5em;
    }
  }
}

.navbar {
  .dropdown-menu {
    margin-top: 0;
    padding: 0;
    > ul {
      list-style: none;
      margin: 0;
      padding: 0;
      > li {
        display: block;
        width: 100%;
      }
      > li > a {
        font-size: $font-size-sm;
        margin: 0;
        padding: $nav-link-padding;
        &:hover {
          background: $dropdown-link-hover-bg;
        }
      }
    }
  }
}

.nav {
  &.flex-column {
    border-radius: $border-radius;
    box-shadow: $box-shadow;

    .nav-link {
      min-width: 200px;
      border-left: 4px solid transparent;
      border-bottom: 1px solid $gray-300;
      padding: $nav-link-padding;
      color: $gray-600;

      &.active {
        border-left-color: theme-color();
        color: theme-color();
      }

      &:hover {
        background-color: $gray-100;
      }
    }

    li {
      &:first-of-type {
        > .nav-link {
          border-top-left-radius: $border-radius;
        }
      }

      &:last-of-type {
        > .nav-link {
          border-bottom-left-radius: $border-radius;
        }
      }
    }
  }
}

.help-tab-pane {
  box-shadow: $box-shadow;
  padding: 1rem;
  border-radius: $border-radius;
  color: $gray-800;
  img {
    max-width: 100%;
    height: auto;
    margin: 0 0 .5rem 0;
    box-shadow: 0 0 2px rgba(0, 0, 0, .2), 0 2px 3px rgba(0, 0, 0, 0.125);
    border-radius: $border-radius;
  }

  .tab-pane-title,
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    color: $gray-800;
    font-weight: $font-weight-light;
  }

  h3,
  h4,
  h5,
  h6 {
    margin-top: 1.75rem;
  }

  .tab-pane-title {
    h2,
    h3,
    h4 {
      margin-top: 0;
    }
  }
}

.link-darker {
  color: $gray-700;
}

.link-dark {
  color: $gray-600;
}