ds4/scss/components/_tabs.scss

nav.tabs {
  height: 40px;
  border-top: 2px groove $c-border-groove;
  border-bottom: 2px groove $c-border-groove;

  .item {
    line-height: 40px;
    font-weight: bold;
  }

  .item.active {
    text-decoration: none;
  }
}