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HTML 

              
                <main class="main-wrapper">
	<div class="inner-wrapper">
		
		<nav class="sidebar-wrapper">
			<a href="#" id="main-nav-toggle">
				<span>Menu</span>
			</a>
			<ul class="nav">
				<li class="nav-item"><a href="#">Navbar Item</a></li>
				<li class="nav-item"><a href="#">Navbar Item</a></li>
				<li class="nav-item"><a href="#">Navbar Item</a></li>
				<li class="nav-item"><a href="#">Navbar Item</a></li>
				<li class="nav-item"><a href="#">Navbar Item</a></li>
			</ul>
			<p class="thank-you-martin">Thanks to <a href="https://dribbble.com/shots/2117849-Login">Martin Strba <i class="fa fa-dribbble"></i></a> for this great UI design found on dribbble!</p>
		</nav>

		<div class="content-wrapper">
			<header class="main-header">
				<h1>Hello World <span>of</span> <strong>Web Design</strong></h1>
			</header>
			<section class="login-form-wrapper">
				<form action="" class="login-form">
					<fieldset>
						<label for="user-name"><i class="fa fa-user"></i> Your User Name</label>
						<input type="text" id="user-name" />
					</fieldset>
					<fieldset>
						<label for="password"><i class="fa fa-lock"></i> Your Password</label>
						<input type="text" id="password" />
					</fieldset>
					<fieldset>
						<a href="#" class="login-forgot-password">Forgot Password?</a>
					</fieldset>
					<fieldset>
						<input type="submit" class="submit" value="Login"/>
					</fieldset>
				</form>
			</section>
			<section class="login-footer">
				<div class="footer-item"><a href="#">More Info <i class="fa fa-lg fa-info"></i></a></div>
				<div class="footer-item"><a href="#">Support <i class="fa fa-lg fa-question"></i></a></div>
				<div class="footer-item"><a href="#">Register <i class="fa fa-lg fa-user-plus"></i></a></div>
			</section>
		</div>
	</div>
</main>
!

CSS 

              
                // Media Breakpoints
$break-xs : 420px;
$break-sm : 768px;
$break-md : 992px;
$break-lg : 1200px;

$main-bg : "https://s3-us-west-2.amazonaws.com/s.cdpn.io/201958/Buildings_City_Sky_Line_Filtered.jpg";

// Media Query Mixins
@mixin mq($break-point) {
	@media (min-width: #{$break-point}) { 
		@content; 
	}
}

// Use for acessability to hide text when using a background image
@mixin hide-text {
    overflow: hidden;
    text-indent: -9000px;
    display: block;
}

// Extends
// Simple Extends to group code
//------------------------------------------------------------------------------//
%flex {
	display: flex;
}
%clear-list {
	margin: 0;
	padding: 0;
	list-style: none;
}

// SCSS
// Below are the css/scss rules to be compiled and compressed.
//------------------------------------------------------------------------------//
@import url(https://fonts.googleapis.com/css?family=Raleway:400,300,700);

* {
	box-sizing: border-box;
}

body {
    color: #f2f2f2;
    margin: 0;
    padding: 0;
    font-family: 'Raleway', sans-serif;
    background-color: #ccc;
    overflow-x: hidden;
}

.main-wrapper {
	width: 100vw;
	min-height: 100vh;
	padding: 0;
	margin: 0;
	background: url($main-bg) no-repeat center center;
	background-size: cover;
}
.inner-wrapper {
	@extend %flex;
	flex-direction: column;
	width: 100vw;
	min-height: 100vh;
	padding: 0;
	margin: 0;
	background: linear-gradient(rgba(86,79,142,0.98) 20%, rgba(44,32,72,0.82));
	
	@include mq($break-sm){
		flex-direction: row-reverse;
	}
}

.sidebar-wrapper {
	min-width: 300px; 
	height: 100vh;
	margin-top: -100vh;
	padding-top: 4.6em;
	display: flex;
	flex-direction: column;
	justify-content: center;
	background: transparentize(#181624, 0.6);
	
	&.active {
		animation: sidebar-wrapper-from-top 1s forwards;
	}
	
	@include mq($break-sm){
		margin-right: -300px;
		margin-top: 0;
		margin-left: auto;
		padding-top: 6em;
		justify-content: flex-start;
		&.active {
			animation: sidebar-wrapper-from-side 1s forwards;
		}
	}
	
	.nav {
		@extend %clear-list;
		
		li {
			font-size: 1.2em;
			font-weight: 300;
			text-align: left;
			border-bottom: 1px solid rgba(0,0,0, 0.2);
			
			a {
				display: block;
				width: 100%;
				padding: 0.6em 1.6em 0.6em;
				text-decoration: none;
				color: #fff;
				@include mq($break-sm){
					padding: 0.6em 0 0.6em 2em;
				}
				
				&:hover {
					background: transparentize(#181624, 0.6);
				}
			}
		}
	}
	.thank-you-martin {
		max-width: 280px;
		color: lighten(#181624, 60%);
		padding: 0 0 0.4em 2.6em;
		font-size: 0.9em;
		margin-top: auto;
		a {
			color: #ffffff;
			text-decoration: none;
		}
	}
}

#main-nav-toggle {
    width: 2.7em;
    display: inline-block;
    transition: all, 1s;
    padding: 1em 0.5em;
    @include hide-text();
	position: absolute;
	top: 2em;
	right: 2em;
	border: 1px solid transparentize(#fff, 0.2);
	border-radius: 4px;
	@include mq($break-sm){
		right: 2em;
	}
    span {
    	display: block;
    	position: relative;
    	height: 2px;
    	width: 1.6em;
    	background-color: transparentize(#fff, 0.2);
    	&::before, &::after{
      		content: "";
      		display: block;
      		background-color: transparentize(#fff, 0.2);
      		width: 1.6em;
      		height: 2px;
    		position: absolute;
      		bottom: 0;
      		transform-origin: 50%;
      		transition: all, 0.2s;
    	}
    	&::after{
      		transform: translateY(0.5em);
    	}
    	&::before {
      		transform: translateY(-0.5em);
    	}
  	}
  	&:hover:not(.active){
    	span {
     		&::before {
        		transform: translateY(-0.625em);
      		}
      		&::after {
        		transform: translateY(0.625em);
      		}
    	}
  	}
  	&.active{
    	overflow: visible;
		margin-left: 2em;
    	span {
      		background-color: transparent;
      		&::before{
        		animation: top-bar 1s;
        		animation-fill-mode: both;
      		}
      		&::after{
        		animation: bottom-bar 1s;                       
				animation-fill-mode: both;
      		}
    	}
  	}
}

.content-wrapper {
	@extend %flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	width: 100%;
	height: 100vh;
}

.main-header {
	margin-bottom: auto;
	width: 14em;
	align-self: flex-start;
	padding-left: 2em;
	@include mq($break-xs){
		width: 18em;
	}
	@include mq($break-sm){
		width: 100%;
		padding-left: 0;
	}
	h1 {
		text-align: left;
		font-weight: 300;
		font-size: 1.6em;
		text-transform: uppercase;
		padding-top: 0.5em;
		@include mq($break-xs){
			font-size: 2em;
			padding-top: 0.25em;
		}
		@include mq($break-sm){
			text-align: center;
		}
		
		span {
			font-size: 0.6em;
			text-transform: lowercase;
		}
	}
}

.login-form-wrapper {
	@extend %flex;
	flex-direction: column;
	justify-content: flex-end;
	width: 90%;
	max-width: 480px;
}

.login-form {
	width: 100%;
	fieldset {
		border: none;
		padding: 0;
		margin-bottom: 1em;
		
		label, input {
			display: block;
		}
		
		label {
			margin-left: 0.4em;
			margin-bottom: 0.4em;
		}
		
		input[type="text"] {
			background: transparent;
			border: 1px solid transparentize(#fff, 0.2);
			border-radius: 4px;
			font-size: 1em;
			padding: 0.5em;
			width: 100%;
			@include mq($break-xs){
				font-size: 1.5em;
			}
			
		}
		
		input[type="submit"] {
			background: linear-gradient(#00ab9b, #059b90, #0a8f86);
			border: none;
			border-radius: 4px;
			font-size: 1.5em;
			padding: 0.5em;
			width: 100%;
			&:hover {
				box-shadow: inset 0 0 1px 1px #ffffff;
			}
		}
		
		.login-forgot-password {
			display: block;
			color: lighten(#181624, 60%);
			text-align: center;
		}
	}
}

.login-footer {
	@extend %flex;
	flex-direction: column-reverse;
	width: 100%;
	margin-top: auto;
	
	@include mq($break-xs){
		flex-direction: row;
	}
	
	.footer-item {
		flex-grow: 1;	
		background: transparentize(#181624, 0.3);

		&:first-of-type {
			background: transparentize(#181624, 0.15);
		}
		&:last-of-type {
			background: transparentize(#181624, 0.45);
		}
		
		a {
			display: flex;
			justify-content: space-between;
			color: lighten(#181624, 60%);
			text-decoration: none;
			padding: 12px;
			@include mq($break-xs){
				padding: 20px;
			}
		}
	}
}

@keyframes sidebar-wrapper-from-top {
	0% {
		margin-top: -100vh;
	}
	100% {
		margin-top: 0;
	}
}

@keyframes sidebar-wrapper-from-side {
	0% {
		margin-right: -300px;
	}
	100% {
		margin-right: 0;
	}
}
@keyframes top-bar {
  50%{
    transform: translateY(0);
  }
  100% {
    transform: rotate(45deg) translateY(0);
    bottom: 0;
  }
}
@keyframes bottom-bar {
  50%{
    transform: translateY(0);
  }
  100% {
    transform: rotate(-45deg) translateY(0);
  }
}
!

JS 

              
                $(document).ready(function(){
	$('#main-nav-toggle').on('click', function(e){
		e.preventDefault();
		$(this).toggleClass('active');
		$(this).parent().toggleClass('active');
	});
});
!
999px

Console