out/artifacts/book/assets/css/less/sidebar/active.less

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//.nav-list li 
.nav-list li {
 .active_state_caret() {
	display: block;
	content: "";

	position: absolute;
	right: 0;
	top: 4px;

	border: 8px solid transparent;
	border-width: 14px 10px;
 }

 &.active > a:after {
	.active_state_caret();
 }
 &.open > a:after {
	//no caret for open menu item
	display: none;
 }
 &.active.no-active-child {
	> a:after {
		//show caret for active menu item with childs which is not open(i.e. no submenu item is active)
		display: block;
	}
 }
}



.nav-list > li {
  li.active > a:after {
	top: 2px;
	border-width: 14px 8px;
  }
}

.nav-list li.active:not(.open) li.active > a:after {
	//hide the active caret when parent submenu is being closed (not open)
	display: none !important;
}