theme_bootstrap/less/moodle/navs.less

// Prevents weird looking tabs on big reports
.nav-justified > li > a {
    padding-left: 4px;
    padding-right: 4px;
    margin-right: 1px;
    white-space: nowrap;
}

// Give a little padding to multi row tabs
.nav-justified {
    padding: 10px 0 0 0;
}

.nav-justified {
    // Reset tabs to collapsed on @screen-sm-min sizes.
    @media (min-width: @screen-sm-min) {
      > li {
        display: block;
        width: 100%;
        float: none;
         > a {
          text-align: center;
          margin-bottom: 5px;
        }
      }
    }
    // Ok to show tabs on medium screens
    @media (min-width: @screen-md) {
        border: 0;
        border-radius: 0;
        > li {
          display: table-cell;
          width: 1%;
          > a {
            margin-bottom: 0;
          }
        }
    }
}



.nav-tabs-justified {
  > li > a {
    // Override margin from .nav-tabs
    margin-right: 1px;
    border-radius: @border-radius-base;
  }

  > .active > a,
  > .active > a:hover,
  > .active > a:focus {
    border: 1px solid @nav-tabs-justified-link-border-color;
  }

  @media (min-width: @screen-sm-min) {
    > li > a {
      border: 1px solid @nav-tabs-justified-link-border-color;
      border-radius: @border-radius-base;
    }
  }
  @media (min-width: @screen-md-min) {
    > li > a {
      border-bottom: 1px solid @nav-tabs-justified-link-border-color;
      border-radius: @border-radius-base @border-radius-base 0 0;
    }
    > .active > a,
    > .active > a:hover,
    > .active > a:focus {
      border-bottom-color: @nav-tabs-justified-active-link-border-color;
    }
  }
}