tabler/assets/scss/dashboard/_nav.scss

.nav-tabs {
	user-select: none;

	.nav-link {
		border: 0;
		color: inherit;
		border-bottom: 1px solid transparent;
		margin-bottom: -1px;
		transition: .3s border-color;
		font-weight: 400;
		padding: 1rem 0;

		&.active {
			border-color: $blue;
			color: $blue;
			background: transparent;
		}

		&:hover:not(.disabled) {
			border-color: $text-muted-dark;
			color: $text-muted-dark;
		}

		&.disabled {
			opacity: .4;
			cursor: default;
			pointer-events: none;
		}
	}

	.nav-item {
		margin-bottom: 0;
		position: relative;

		i {
			margin-right: .25rem;
			line-height: 1;
			font-size: px2rem(14px);
			width: px2rem(14px);
			vertical-align: baseline;
			display: inline-block;
		}

		+ .nav-item {
			margin-left: 1.25rem;
		}

		&:hover {

			.nav-submenu {
				display: block;
			}
		}
	}

	.nav-submenu {
		display: none;
		position: absolute;
		background: #fff;
		border: 1px solid $border-color;
		border-top: none;
		z-index: 1;
		box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
		min-width: 10rem;
		border-radius: 0 0 3px 3px;

		.nav-item {
			display: block;
			padding: .5rem 1rem;
			color: $text-muted;
			margin: 0 !important;
			cursor: pointer;
			transition: .3s background;

			&.active {
				color: $link-color;
			}

			&:hover {
				color: $text-muted-dark;
				text-decoration: none;
				background: rgba(0, 0, 0, .024);
			}
		}
	}
}

.nav-link {
	display: block;
	padding: 0.25rem 0.75rem;
}