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HTML

              
                
    <nav class="navigation">

        <ul class="menu"><li><a class="active" href="#"><svg class="home" width="30px" height="30px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path d="M419.492,275.815v166.213H300.725v-90.33h-89.451v90.33H92.507V275.815H50L256,69.972l206,205.844H419.492 z M394.072,88.472h-47.917v38.311l47.917,48.023V88.472z"/></svg><span title="Home">Home</span></a></li><li><a href="#"><svg class="about" width="30px" height="30px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path d="M407.448,360.474c-59.036-13.617-113.989-25.541-87.375-75.717 c81.01-152.729,21.473-234.406-64.072-234.406c-87.231,0-145.303,84.812-64.072,234.406c27.412,50.482-29.608,62.393-87.375,75.717 c-59.012,13.609-54.473,44.723-54.473,101.176h411.838C461.919,405.196,466.458,374.083,407.448,360.474z"/></svg><span title="About">About</span></a></li><li><a href="#"><svg class="work" width="30px" height="30px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path d="M201.875,141.084h-30v-30.563c0-11.747,9.523-21.271,21.271-21.271h125.709 c11.747,0,21.271,9.523,21.271,21.271v30.563h-30v-17.063c0-3.739-3.031-6.771-6.771-6.771h-94.709 c-3.739,0-6.771,3.031-6.771,6.771V141.084z M462,161.084V422.75H50V161.084H462z M347.818,228.582l-4.721-10.858 c-44.045,27.402-67.739,48.047-103.599,88.742c-19.074-13.598-29.838-19.846-46.809-28.057l-14.509,13.412 c29.016,26.895,44.784,44.631,68.409,72.456C284.896,295.584,311.497,260.279,347.818,228.582z"/></svg><span title="Work">Work</span></a></li><li><a href="#"><svg class="lab" width="30px" height="30px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path d="M225.741,122.262c-10.096-4.89-19.027-8.84-27.496-12.287C211.636,74.43,230.974,51,256.001,51 c24.381,0,43.363,22.232,56.707,56.239c-8.562,3.61-17.355,7.632-27.344,12.62C275.138,93.088,263.472,81,256.001,81 C248.31,81,236.177,93.811,225.741,122.262z M256.001,431c-7.471,0-19.135-12.088-29.361-38.86 c-10.084,5.036-18.803,9.016-27.346,12.621C212.64,438.767,231.62,461,256.001,461c25.029,0,44.365-23.43,57.758-58.974 c-8.439-3.436-17.34-7.367-27.496-12.288C275.827,418.19,263.692,431,256.001,431z M174.112,393.154 c-33.35,12.045-83.111,23.78-102.887-5.42c-9.77-14.427-13.416-42.163,24.695-92.376c10.111-13.322,21.816-26.408,33.689-38.419 c26.635-26.545,56.641-52.096,95.738-78.552c-18.822-10.192-39.367-19.936-59.412-27.187c-20.52-7.424-38.586-11.535-52.428-11.535 c-8.842,0-15.404,1.843-17.553,4.93c-2.285,3.281-2.398,13.373,7.744,31.476c1.201-0.132,2.418-0.206,3.652-0.206 c18.225,0,33,14.775,33,33c0,18.227-14.775,33-33,33s-33-14.773-33-33c0-5.902,1.559-11.439,4.273-16.233 c-19.311-33.481-15.328-53.631-7.291-65.177c5.648-8.115,17.551-17.789,42.174-17.789c43.723,0,102.635,28.356,140.564,50.322 c38.51-23.28,99.422-53.988,144.42-53.988c24.723,0,36.639,9.932,42.281,18.264c9.77,14.428,13.416,42.164-24.693,92.377 C362.44,287.316,255.792,363.653,174.112,393.154z M392.185,198.504c26.182-34.497,26.984-52.643,23.75-57.418 c-2.189-3.232-8.545-5.086-17.441-5.086c-33.951,0-85.664,24.93-115.436,41.803c21.982,14.287,42.518,29.346,61.24,44.701 c-7.084,7.058-14.51,13.981-22.102,20.68c-20.783-16.807-43.885-33.264-67.832-48.011c-27.5,17.708-55.186,38.509-80.055,60.672 c18.705,16.243,40.973,33.296,64.725,49.076c-9.086,5.654-18.26,11.073-28.729,16.744c-0.004-0.003-0.006-0.005-0.01-0.007 c-0.078-0.055-0.154-0.109-0.232-0.164c-19.885-13.853-39.51-29.054-57.662-44.965c-49.02,49.168-62.828,84.795-56.336,94.383 c2.189,3.233,8.549,5.088,17.443,5.088c40.871,0,105.748-34.459,144.129-59.173C304.759,286.485,358.495,242.895,392.185,198.504z M433.524,319.63c2.441-4.605,3.83-9.855,3.83-15.432c0-18.225-14.775-33-33-33s-33,14.775-33,33c0,18.227,14.775,33,33,33 c1.521,0,3.016-0.112,4.48-0.312c9.611,17.505,9.453,27.295,7.209,30.519c-2.148,3.086-8.709,4.929-17.551,4.929 c-27.856,0-66.664-16.141-91.65-28.324c-8.357,5.839-18.73,12.77-28.846,19.122c33.494,17.717,82.752,39.202,120.496,39.202 c24.621,0,36.523-9.674,42.172-17.788C448.683,373.03,452.663,352.955,433.524,319.63z"/></svg><span title="Lab">Lab</span></a></li><li><a href="#"><svg class="contact" width="30px" height="30px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path d="M170.544,239.052L50,146.454v213.142L170.544,239.052z M460.928,103.407H51.416l204.593,157.162L460.928,103.407z M313.355,260.696l-57.364,43.994l-57.454-44.135L50.5,408.593h410.751L313.355,260.696z M341.367,239.212L462,359.845V146.693L341.367,239.212z"/></svg><span title="Contact">Contact</span></a></li></ul>

    </nav>

    <section class="codepen-style">
        <h1>Side navigation menu <span>V2</span></h1>
      <h2>Responsive Web Design</h2>
        <p>Created with <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="30px" height="30px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><path id="favorite-6-icon" d="M256,462L53.676,284.644V130.646L169.034,50L256,104.977L342.965,50l115.359,80.646v153.998L256,462z M93.801,266.457L256,408.64l162.198-142.183V151.553l-76.35-53.375L256,152.447l-85.849-54.27l-76.351,53.375V266.457z"/></svg> by <a href="http://pablogarciafernandez.com" target="_blank">Pablo García Fernández</a></p>
    </section>
              
            
!

CSS

              
                /*	
	Side Navigation Menu V2, RWD
	===================
	Author: @heyPablete

 */

@import url(http://pablogarciafernandez.com/css/reset.css);

/* Typography
------------------------------------- */
@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Open+Sans:300,400,700);

body {
	  font-family: 'Open Sans', sans-serif;
	  font-size: 1em;
	  font-weight: 300;	
	  font-style: normal;
	  word-spacing: normal;
	  letter-spacing: normal;
	  text-rendering: optimizeLegibility;
	  line-height: 1.8em;
	  color:#717171;
}

h1 {
	  font-size: 2em;
  	font-weight: 300;
	  line-height: 4em;
  	text-transform: uppercase;
  	color: #BDBDBD;
}
h2 {
	  font-size: 1.4em;
  	font-weight: 400;
	  line-height: 1em;
}

p {
  font-size: 1.16em;
  line-height: 4em;
}

p svg {
  display: inline-block;
  vertical-align: middle;
}

a {
	  font-size: 1em;
	  font-weight: 400;
	  line-height: 100%;
	  color: #3A53BD;
}
a:hover { text-decoration: none; }

a[href$="http://pablogarciafernandez.com"] {
	font-size: 1em;
	font-weight: 700;
	letter-spacing: -0.04em;
	text-decoration: none;
	text-transform: uppercase;
	color: #575757;
	margin: 1.4em 0 1.4em;
	display: inline;
}

	/* ----------- CodePen styles ----------- */
	.codepen-style {
		padding: 2em 0 0 0;

	}

		.codepen-style h1 {
			  font-family: 'Open Sans', sans-serif;
			  font-size:3em; 
			  font-weight: 300;
			  color:#000;
			  line-height:1.8em;
			  text-transform: none;
		}

		.codepen-style h1 span {
			  font-style: italic;
			  font-weight: 700;
			  text-transform: none;
			  color: red;
		}

		.codepen-style h2 {
			  font-weight: 300;
			  text-transform: none;
		}

		.codepen-style h2 a {
		  	font-weight: 700;
		}
/* ----------- End CodePen styles ----------- */


/* Structure MOBILE FIRST
------------------------------------- */

body {
  background: #f1f1f1;
  padding: 1em 8% 10em;
}

	/* Navigation
	----------------- */
	
	.navigation {
	  height: auto;
		 width: 100%;
		 display: block;
    box-shadow: #D4D4D4 -1px 1px, #D4D4D4 -2px 2px, #D4D4D4 -3px 3px, #D4D4D4 -4px 4px, #D4D4D4 -5px 5px, #D4D4D4 -6px 6px;
    transform: translate3d(4px, 0px, 0);
    background-color: #D4D4D4;
 
	}

	.navigation li { width: 100%; }

	.navigation a {
		  display: block;
		  padding: 0.5em 0 0.5em 1em;
		  margin: 0;
		  line-height: 2em;
		  font-weight: 400;
		  color: #333;
		  text-transform: uppercase;
	}
	.navigation a:hover {
		  background-color: #666;
		  color: #333;
     box-shadow: -1px 1px, -2px 2px, -3px 3px, -4px 4px;
      transform: translate3d(4px, -4px, 0);
      transition: .15s;
	}

.navigation a > span:after {
  content: " /";
  padding-left: 0.2em;
}

	.navigation li:nth-child(1) a { background-color: #00FF96 ; }
	.navigation li:nth-child(2) a { background-color: #FF6524 ; }
	.navigation li:nth-child(3) a { background-color: #FFA300 ; }
	.navigation li:nth-child(4) a { background-color: #FFCD00 ; }
	.navigation li:nth-child(5) a { background-color: #F2F600 ; }

	.navigation li:nth-child(1) a:hover,
	.navigation li:nth-child(2) a:hover,
	.navigation li:nth-child(3) a:hover,
	.navigation li:nth-child(4) a:hover,
	.navigation li:nth-child(5) a:hover { background-color: #666; }

	.navigation svg {
		  width: 30px;
		  height: 1.5em;
		  vertical-align: text-top;
	}
	svg {
		  opacity:1;
		  fill-opacity:1;
		  fill-rule:nonzero;
		  vertical-align: top;
		  fill: #333;
	}

	.navigation a:hover svg { fill: #333; }

	.navigation span{
		  display: inline-block;
		  padding-left: 0.5em;
	}

	/* END Navigation 
	----------------- */


/* Structure DESKTOP
------------------------------------- */
@media only screen and (min-width: 1024px) {

	body { padding: 2em 0 0 4em; }

	header, article, section, footer {
	  margin: 0 auto;
	  max-width: 670px;
	  width: auto;
	  display: block;
	}

	header { padding-top: 0; }

	/* Navigation
	----------------- */

	.navigation {
	    transition-delay: 0s;
	    transition-duration: 0.4s;
	    transition-property: all;
	    transition-timing-function: line;
    
    box-shadow: 0 0;
    transform: translate3d(0px, 0px, 0);
	}

	.navigation a:hover {
	    transition-delay: 0s;
	    transition-duration: 0.2s;
	    transition-property: all;
	    transition-timing-function: line;
    
    box-shadow: #303030 -1px 1px, #333 -2px 2px, #2E2E2E -3px 3px, #2B2B2B -4px 4px, #292929 -5px 5px, #262626 -6px 6px;
    transform: translate3d(6px, 0px, 0);
	}

	.navigation {
		  position: fixed;
	  	left: 0;
		  top: 0;
		  bottom: 0;
		  height: 100%;
		  width: 4em;
		  background-color: #333;
	}
	.navigation:hover {
		  position: fixed;
	  width: 10em;
	}

	.navigation ul { display: block; }

	.navigation li { display: block; }

	.navigation a {
		  padding: 0.8em 0.6em 0.8em 1em;
		  color: #F1F1F1;
		  border-bottom: 1px solid transparent;
		  border-top: 1px solid transparent;
	}

	.navigation li:nth-child(1) a,
	.navigation li:nth-child(2) a,
	.navigation li:nth-child(3) a,
	.navigation li:nth-child(4) a,
	.navigation li:nth-child(5) a { background-color: transparent; }
	.navigation a:hover {
		  display: inline-block;
		  padding: 0 0 0 1em;
		  margin: 0;
		  line-height: 2em;
		  font-weight: 400;
	  	width: 6em; 
	}

	.navigation:hover a {
		  display: inline-block;
		  width: 9em;
		  padding: 0.8em 0 0.8em 1em;
	}
	.navigation span { text-indent: -200px; }

  .navigation:hover span {
		  display: inline-block;
		  text-indent: 0;
	}
	.active { background-color: #F1F1F1; }
  
.navigation a > span:after { color: #666; }
.navigation a:hover > span:after { color: #333; }

	.navigation svg {
		  width: 30px;
		  height: 2em;
		  vertical-align: top;
	}

	.navigation svg:hover { fill: #333; }

	.home { fill: #00FF96; }
	.about { fill: #FF6524; }
	.work { fill: #FFA300; }
	.lab { fill: #FFCD00; }
	.contact { fill: #F2F600; }

	/* Menu position on the navigation bar */
	.menu {
		  left: 0;
		  position: fixed;
		  height: auto;
		  width: auto;
	}
	.menu { top: 0; }
	/* END Menu position on the navigation bar */
	

	/* ----------------- 
		End Navigation */

}

 /* Structure DESKTOP when is 1920px height or more
------------------------------------- */
@media only screen and (min-height: 1920px){
	.navigation:hover { width: 8.592em; }
	.navigation a {
		  font-size: 0.9em;
		  padding: 0.8em 0.8259em 0.8em 1em;
	}

}
              
            
!

JS

              
                
              
            
!
999px

Console