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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <input type="checkbox" id="navcheck" role="button" title="menu">
<label for="navcheck" aria-hidden="true" title="menu">
	<span class="burger">
		<span class="bar">
			<span class="visuallyhidden">Menu</span>
		</span>
	</span>
</label>
<nav id="menu">
	<a href="#">Lorem.</a>
	<a href="#">Nesciunt!</a>
	<a href="#">Magnam.</a>
	<a href="#">Ipsum.</a>
	<a href="#">Voluptatem.</a>
	<a href="#">Quibusdam.</a>
</nav>
<main>
	<article class="content">
			<h1>UI with UX improvement with only awesome CSS</h1>
		<p><strong>Burger icon, animated nav background and off-trigger area (outside nav opened) made width pseudo-elements. No JS at all :)</strong></p>
		<p><strong>No repaint, no reflow, no JS, but the blur effect may be a little laggy, particularly on mobile devices.</strong></p>
		<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Laborum asperiores, minima obcaecati ex iusto alias minus excepturi sunt! Asperiores quibusdam iure numquam quis dicta at quisquam debitis minima perspiciatis modi?</p>
		<p>Asperiores impedit neque porro, minus cum. Nesciunt blanditiis, dolorum explicabo esse voluptates voluptas doloribus, vero voluptate veniam impedit nam doloremque unde inventore ipsum iste magnam perferendis assumenda in sunt deleniti.</p>
		<p>Cum quidem eum quos provident placeat aut tempore rem voluptates eveniet? Eos impedit aspernatur hic tenetur ipsum tempora exercitationem libero voluptas numquam necessitatibus. Error quisquam quaerat debitis suscipit velit dolore.</p>
		<p>Atque, ab libero! Cum quae cumque voluptate culpa accusantium iste aliquam illum quos facere quisquam, delectus, magnam neque dicta quibusdam libero itaque dolorem, tenetur vel dolores laudantium ratione asperiores voluptatibus.</p>
		<p>Fugiat praesentium omnis maiores atque sed perspiciatis quia laboriosam! Eius mollitia iusto quia libero, voluptate laborum labore ducimus beatae, quisquam, dicta laboriosam culpa voluptatem impedit maxime, a ex pariatur dignissimos.</p>
		<p>Dolores odio dolore quo? Autem iure dolorem ratione, odit reiciendis. Non pariatur voluptates, explicabo vitae, rem molestias in. Voluptates expedita iusto blanditiis commodi numquam. Hic atque natus dolore cupiditate velit.</p>
		<p>Ipsam ipsum quos, quibusdam nulla commodi dolorem impedit soluta odio natus. Ullam dolor consequatur tenetur similique cupiditate debitis natus tempore molestiae quo, inventore in quia earum explicabo eaque qui facilis.</p>
		<p>Iure, natus. Ipsam officia nostrum minima ut blanditiis asperiores neque esse itaque reprehenderit, et, porro ea nemo eligendi cum soluta fuga similique? Soluta, nam odio praesentium quas officia repellendus dicta.</p>
		<p>Modi voluptates, doloremque aliquam. Magnam numquam fugit aliquam veniam officiis iusto et assumenda cupiditate aspernatur voluptas expedita quo voluptatibus repudiandae, sapiente molestias, culpa eos placeat possimus quae! Aliquid dicta, atque?</p>
		<p>Laborum magni ipsam iure iste blanditiis saepe. Optio obcaecati quaerat soluta, vitae. Asperiores reiciendis minima, quidem iusto explicabo culpa quaerat atque! Cum nesciunt nam ducimus mollitia iste sapiente sit, eos.</p>
	</article>
</main>
            
          
!
            
              $timing-function   : cubic-bezier(0.190, 1.000, 0.220, 1.000);
$nav-width-desktop : 40em;
$nav-width-mobile  : 25em;
$nav-item-nb       : 6;

input {
	position: fixed;
	opacity: 0;
}
label {
	position: absolute;
	margin: 0;
	padding: 0;
	border: none;
	outline: none;
	background: none;
	cursor: pointer;
	&::before {
		position: fixed;
		z-index: 1;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
		background-color: rgba(darken(#3498db,30%),.6);
		content: '';
		opacity: 0;
		pointer-events: none;
		transition: opacity .5s $timing-function;
	}
	.burger {
		position: fixed;
		top: 1em;
		left: 1em;
		z-index: 3;
		width: 2em;
		height: 2em;
		margin: 0;
		padding: 0;
		transition: opacity .5s $timing-function;
		&::before,
		.bar,
		&::after {
			position: absolute;
			left: 0;
			display: block;
			width: 100%;
			height: 12%;
			background: white;
			content: '';
			transition: all .5s $timing-function;
		}
		.bar {
			top: 44%;
		}
		&::before {
			top: 0;
			transform-origin: top left;
		}
		&::after {
			bottom: 0;
			transform-origin: bottom left;
		}
	}
}

input:focus + label,
label:hover {
	.burger {
		opacity: .75;
	}
}

nav {
	position: fixed;
	top: 0;
	left: 0;
	bottom: 0;
	z-index: 2;
	display: flex;
	flex-flow: column nowrap;
	justify-content: center;
	align-items: flex-start;
	transform: translate3d(0,0,0); /* material acceleration */
	transform: translateX(-100%);
	will-change: transform;
	transition: transform .5s $timing-function;
	&::before {
		position: absolute;
		top: 0;
		bottom: 0;
		left: 0; 
		z-index: -1;
		width: $nav-width-mobile;
		background: #d62956;
		content: '';
		transform: skewX(15deg) translateX(-100%);
		transform-origin: bottom left;
		will-change: transform;
		transition: transform .5s $timing-function;
		@media(min-width: 40em) {
			width: $nav-width-desktop;
		}
	}
	a {
		margin: .5em 0;
		padding: .2em 2em;
		font-size: 1.5em;
		color: white;
		text-decoration: none;
		font-weight: 500;
		transform: translateX(-100%);
		transition: color .15s, transform .5s;
		transition-timing-function: $timing-function;
		@for $i from 1 through $nav-item-nb {
			&:nth-child(#{$i}) { transition-delay: 0s, #{50 + (50 * $i)}ms; }	
		}
		&:hover, &:focus {
			color: black;
		}
	}
}

main {
	overflow: hidden;
	.content {
		transform: translate3d(0,0,0); /* material acceleration */
		will-change: transform, filter;
		transition: all .5s $timing-function;
	}
}

[id="navcheck"]:checked {
	& + label {
		&::before {
			opacity: 1;
			pointer-events: auto;
		}
		.burger {
			&::before,
			&::after {
				width: 141.42%; // Pythagore!
			}
			&::before {
				transform: rotate(45deg) translateY(-50%);
			}
			&::after {
				transform: rotate(-45deg) translateY(50%);
			}
			.bar {
				transform: scale(0.1);
			}
		}
	}
	& ~ nav {
		transform: translateX(0);
		&::before {
			transform: skewX(15deg) translateX(0);
		}
		a {
			transform: translateX(0);
		}
	}
	& ~ main .content {
		transform: translateX(3em);
		transform-origin: left center;
		-webkit-filter: blur(2px);
		        filter: blur(2px); /* quite laggy :S */
	}
}

/* helper */
.visuallyhidden { border:0; clip:rect(0 0 0 0);	height:1px; margin:-1px; overflow:hidden; padding:0; position:absolute; width:1px; }

/* misc */
body { overflow-x: hidden; background: #444; color: white; font: 1em/1.4 "lato"; }
main { background: #3498db; padding: 5% 0; }
article { width: 80%; margin: 0 auto; font-size: 1.3em; @media(min-width: 60em) { width: 50%; } }
h1 { font: 2.5em/1.4 "roboto condensed"; font-weight: 700; }
            
          
!
            
              	/*
	NO JS, I said! ^^
	*/
            
          
!
999px
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