website/_sass/_tabs.scss

.tabs {
  margin: 1rem 0;

  .tab-content {
    border: 1px solid $nav-tabs-border-color;
    border-top-width: 0;
    border-radius: 0 0 $nav-tabs-border-radius $nav-tabs-border-radius;
  }

  .tab-pane {
    padding: $spacer;

    > {
      h1,
      h2,
      h3,
      h4,
      h5,
      h6,
      p,
      ul,
      ol,
      pre,
      blockquote,
      .highlighter-rouge {
        &:first-child {
          margin-top: 0;
        }

        &:last-child {
          margin-bottom: 0;
        }
      }
    }
  }
}

.nav-tabs {
  @extend .bg-faded;
  border-radius: $nav-tabs-border-radius $nav-tabs-border-radius 0 0;
  border: 1px solid $nav-tabs-border-color;
  padding: ($spacer / 2);
  padding-bottom: 0;
}