open-consul/ui-v2/app/styles/components/tabs.scss

.tab-nav {
  @extend %tab-nav;
}
%tab-nav.animatable {
  @extend %with-animated-tab-selection;
}
.tab-section {
  @extend %tab-section;
  /* this keeps in-tab-section toolbars flush to the top, see Node Detail > Services */
  margin-top: 0 !important;
}