grafana/public/sass/components/_tabs.scss

.nav-tabs-alt {

	& > li > a {
	  color: darken($link-color, 20%);
	}

	li > a:hover {
    border-bottom: none;
	}

	li.active > a,
	li.active > a:focus,
	li.active > a:hover {
    @include border-radius(3px);
	  border: 1px solid $divider-border-color;
	  background-color: transparent;
	  border-bottom: 1px solid $panel-bg;
	  color: $link-color;
	}

	li.disabled > a {
		color: $text-color;
	}

	.open .dropdown-toggle {
		background-color: #060606;
		border-color: transparent;
	}

  .tab-content {
    padding: 10px;
    background-color: $panel-bg;
  }
}