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HTML 

              
                <div id="main-wrapper">
	
	<div class="contrast-bg">
		<h1>Sidebar Navigation</h1>
		<p>A CSS-Only Sidebar menu for websites.</p>
	</div>
	
	<div class="container">
		
		<div class="contrast-bg">
			
			<p>Hover over the menu-icon in the right upper corner to open the sidebar-menu.</p>
			
		</div>
		
	</div>
	
</div>

<!-- Navigation-Element -->
<nav>
	<ul>
		<li><a href="#0">Home</a></li>
		<li><a href="#0">About</a></li>
		<li>
			<a href="#0">Clients</a>
			<ul>
				<li>
					<a href="#0">Burger King</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Southwest Airlines</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Levi Strauss</a>
					<ul>
						<li><a href="#0">Project 1</a></li>
						<li><a href="#0">Project 2</a></li>
						<li><a href="#0">Project 3</a></li>
					</ul>
				</li>
			</ul>
		</li>
		<li>
			<a href="#0">Services</a>
			<ul>
				<li>
					<a href="#0">Print Design</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Web Design</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
				<li>
					<a href="#0">Mobile App Development</a>
					<ul>
						<li><a href="#0">Subservice 1</a></li>
						<li><a href="#0">Subservice 2</a></li>
						<li><a href="#0">Subservice 3</a></li>
					</ul>
				</li>
			</ul>
		</li>
		<li><a href="#0">Contact</a></li>
	</ul>
</nav>
!

CSS 

              
                /* Main-Wrapper */
nav {
	
	position: fixed;
	width: 150px;
	left: -150px;
	top: 0;
	bottom: 0;
	background-color: rgba( 0, 0, 0, .9 );
	padding: 15px 0;
	transition: left 1s ease-in .5s;
	
	&:after {
		
		content: "\f0c9";
		font-family: "FontAwesome";
		font-weight: 400;
		font-style: normal;
		text-decoration: inherit;
		color: #ffffff;
		position: absolute;
		left: 100%;
		top: 0;
		padding: 15px;
		background-color: rgba( 0, 0, 0, .9 );
		border-bottom-right-radius: 5px;
		cursor: pointer;
		
	}
	
	&:hover {
		
		left: 0;
		transition: left 1s ease-in 0s;
		
		&:after {
			
			content: "\f00d";
			
		}
		
	}
	
}
/* Main-Wrapper - End */


/* Global Styles */
nav {
	
	ul {
		
		list-style-type: none;
		padding: 0;
		margin: 0;
		
		li {
			
			position: relative;
			
			a {
				
				padding: 10px 5px;
				padding-left: 30px;
				
			}
			
			&:hover {
				
				background-color: rgba( 0, 150, 255, 1 );
				
				& > ul {
					
					top: 0%;
					
				}
				
			}
			
			& > ul {
				
				position: absolute;
				background-color: rgba( 0, 0, 0, .9 );
				width: 100%;
				top: 1999px;
				left: 100%;
				transition: top .5s;
				
				li {
					
					min-width: 120px;
					
				}
				
				&:hover {
				
					top: 0%;
					
				}
				
			}
			
		}
		
		a {
			
			color: #ffffff;
			text-decoration: none;
			padding-left: 25px;
			display: block;
			
			&:after {
				
				content: "\f054";
				font-family: "FontAwesome";
				display: block;
				position: absolute;
				left: 15px;
				top: 13px;
				font-size: 12px;
				
			}

		}
		
	}
	
	/* First-Level Navigation */
	& > ul {
		
		margin-top: 32px;
		
	}
	
}
/* Global Styles - End */


/* Sidebar */

	/* Multi-Level Navigation */
	
  
  /* Alternative Style */
  /* Looks cool, but a bit unhandy. Just de-coment the next-lines */
  /*
    nav {
		
		ul {
			
			li {
				
				background-color: rgba( 0, 0, 0, .4 );
				
				& > ul {
					
					position: unset;
					background-color: transparent;
					margin-left: 10px;
					max-height: 0;
					transition: max-height .5s;
					overflow: hidden;
					
				}
			
				&:hover {
					
					background-color: rgba( 0, 150, 255, .4 );
					
					& > ul {
						
						max-height: 999px;
						overflow: visible;
						
					}
					
				}
			
			}
			
		}
		
	}
  /**/

/* Some CSS to prettyfy the screen */
body {

	text-align: center;
	font-family: Arial, sans-serif;
	margin: 0;
	min-height: 100vh;

	position: relative;
	z-index: 1;
	overflow: hidden;
	overflow-y: auto;

	background: linear-gradient(180deg, rgba(48,136,255,1) 0%, rgba(255,115,118,1) 100%);
	background-repeat: no-repeat;

	&:after {

		content: " ";
		display: block;
		
		width: 100%;
		height: 100%;
		
		position: absolute;
		left: 0;
		top: 0;
		
		z-index: -1;
		opacity: .8;
		
		background-image: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="28" height="49" viewBox="0 0 28 49"%3E%3Cg fill-rule="evenodd"%3E%3Cg id="hexagons" fill="%239C92AC" fill-opacity="0.4" fill-rule="nonzero"%3E%3Cpath d="M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');

	}
	
	a {
		color: #0078cc;
		text-decoration: none;
	}
	
	#main-wrapper {
		
		padding: 40px 0;
		
	}
	
	.contrast-bg {
		
		padding: 15px;
		background-color: rgba( 255, 255, 255, .6 );
		
		&:first-child {
			
			margin-bottom: 60px;
			
		}
		&:last-child {
			
			margin-top: 60px;
			
		}
		
		p {
			
			margin-top: 0;
			
		}
		
	}
	
	.container {
		
		width: 100%;
		max-width: 1200px;
		margin: 0 auto;
		display: block;
		
		.left {
			
			text-align: left;
			width: 25%;
			margin: 0 15px;
			
		}
		.right {
			
			text-align: left;
			width: 75%;
			margin: 0 15px;
			
		}
		
	}

}
@media ( max-width: 767px ) {
	
	body .container {
		
		display: block;
		
	}
	body .container .left,
	body .container .right {
		
		margin: 15px;
		width: calc( 100% - 60px );
		
	}
	
}
!

JS
!
999px

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