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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                link(href="https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css" rel="stylesheet")

nav#navigation
	ul
		li
			a(href="#")
				i.ion-ios-speedometer-outline
				span Dashboard
		li
			a(href="#")
				i.ion-chatbubbles
				span Forum
		li.dropdown(rel="1")
			a(href="#")
				i.ion-email
				span Messages
				ul.dropdown-1
					li
						a(href="#")
							i.ion-email
							span Read
					li
						a(href="#")
							i.ion-email-unread
							span Unread
					li
						a(href="#")
							i.ion-plus
							span Create Message
		li.dropdown(rel="2")
			a(href="#")
				i.ion-gear-a
				span Settings
				ul.dropdown-2
					li
						a(href="#")
							i.ion-person
							span Edit Profile
					li
						a(href="#")
							i.ion-gear-b
							span Edit Options
		li
			a(href="#")
				i.ion-log-out
				span Logout
#wrapper
	span Lorem ipsum dolor sit amet, pri at quot exerci, pri in debet detraxit. Nostrum postulant has ut, ne pri tempor albucius accommodare, dicat munere integre id est. Ut liber ignota temporibus quo, vel modus doctus honestatis eu, his ea atqui veniam suscipit. Cu tritani torquatos has, cu civibus petentium disputando duo. Oporteat molestiae urbanitas ei mel. Id verear meliore nonumes est, no affert oporteat sapientem vis.
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CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans');

@function tint($percent) {
	@return mix(white, black, $percent);
}

$bg: tint(15);
$bg-hover: tint(18);

$sub-bg: tint(9);
$sub-bg-hover: tint(12);

$border: #293649;
$link-color: #126CA1;
$font: 'Open sans', sans-serif;

$time: 150ms;

@mixin transition($duration, $timing-func) {
	-webkit-transition: $duration $timing-func all;
	   -moz-transition: $duration $timing-func all;
			transition: $duration $timing-func all;
}

* {
	margin: 0;
	padding: 0;
	font-family: $font;
	-webkit-box-sizing: border-box;
	   -moz-box-sizing: border-box;
			box-sizing: border-box;
}

body {
	background: #333;
}

nav#navigation {
	position: fixed;
	width: 225px;
	height: 100%;
	background: $bg;
	border-right: 1px solid $border;

	ul {
		list-style: none;

		li {
			position: relative;
			display: block;
			width: 100%;
			height: 60px;
			border-bottom: 1px solid $border;
			
			&.active {
				background: $bg-hover;
			}
			
			&.dropdown {
				//Include this if you want pure CSS dropdown menus
				&:hover {
					ul[class*="dropdown-"] {
						visibility: visible;
						opacity: 1;
					}
				}
				
				&:before {
					font-family: ionicons;
					content: "\f125";
					position: absolute;
					margin: 20px 0 0 0;
					left: 85%;
					color: #aaa;
				}
			}

			&:hover:after {
				width: 225px;
			}

			&:after {
				content: " ";
				position: absolute;
				z-index: 1;
				width: 0px;
				height: 2px;
				margin: -2px 0 0 0;
				background: $link-color;
				@include transition($time, ease);
			}

			a {
				display: block;
				width: 100%;
				line-height: 60px;
				padding: 0 15px;
				text-decoration: none;
				color: #aaa;
				@include transition($time, ease);
				
				&:hover {
					background: $bg-hover;
					color: #eee;
				}
				
				i,
				span {
					display: inline-block;
				}
				
				i {
					position: absolute;
					font-size: 1.3em;
				}
				
				span {
					margin: 0 0 0 35px;
					font-size: 0.85em;
				}
			}

			ul[class*="dropdown-"] {
				position: absolute;
				display: block;
				margin: -61px 0 0 225px;
				visibility: hidden;
				opacity: 0;
				@include transition($time, ease);
				
				li {
					width: 225px;
					background: $sub-bg;
					a {
						&:hover {
						background: $sub-bg-hover;
						}
					}
				}
			}
		}
	}
}

#wrapper {
	margin: 0 0 0 225px;
	padding: 15px;
	color: #aaa;
}
!

JS 

              
                /*
*	Remove jQuery if you want pure css dropdown menus
*/

/*jQuery(document).ready(function($) {
	$("li.dropdown").hover(function() {
		var id = $(this).attr("rel");
		$(this).toggleClass("active");
		$("ul.dropdown-" + id).toggle("fade", 250);
	});
});*/
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999px

Console