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HTML 

              
                <section class="wrapper">
  <header>
    <section class="userpanel">
      <div class="user">
        <div class="notification"><span class="entypo-bell"></span><span class="number">6</span></div>
        <div class="picture"><img src="http://lorempixel.com/output/people-q-c-400-400-9.jpg" alt="User Name" /></div>
        <div class="name">Nombre Usuario<span class="entypo-down-open"></span></div>
        <div class="drop"></div>
      </div>
    </section>
  </header>
  <aside>
<nav role='navigation'>
  <ul>
   <li><a href="#"><span class="entypo-rocket"></span><span class="menu-item">Escritorio</span></a></li>
	<li><a href="#"><span class="entypo-archive"></span><span class="menu-item">Clientes</span></a></li>
	<li><a href="#"><span class="entypo-briefcase"></span><span class="menu-item">Proyectos</span></a></li>
	<li><a href="#"><span class="entypo-user"></span><span class="menu-item">Usuarios</span></a></li>
	<li class="has-sub"><a href="#"><span class="entypo-battery"></span><span class="menu-item">Alimentadores</span></a>
    </li>
    <ul class="subnav">
		<li><a href="#"><span class="entypo-right-open"></span> <span>Cargos</span></a></li>
		<li><a href="#"><span class="entypo-right-open"></span> <span>Niveles de Usuario</span></a></li>
		</ul>
  </ul>
</nav>  
  </aside>
  <section class="main-content">
    <div class="container">
    </div>
  </section>
  <footer></footer>
</section>
!

CSS 

              
                /* Import fonts */
@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,300,300italic,400italic,600,600italic,700,700italic,800,800italic);

@import url(http://weloveiconfonts.com/api/?family=entypo);

/* Entypo */
[class*="entypo-"]:before {
  font-family: 'entypo', sans-serif;
}

* {
  box-sizing:border-box;
  -moz-box-sizing:border-box;
}
html, body {
  height:100%;
}
body {
    color: #797979;
    background: #EEE;
    font-family: 'Open Sans', sans-serif;
    font-size:13px;
}
a:link, a:visited, a:active {
	color:#333;
	text-decoration:none;
}
a:hover {
	color:crimson;
}
::selection {
    background: crimson;
    color: #fff;
}
.wrapper {
    width: 100%;
    height: 100%;
}
header {
  min-height:55px;
  background:#333;
  position:fixed;
  left:0;
  right:0;
  z-index:1002;
}
/* NAVIGATION */
nav {
	width: 80px;
	height: 100%;
	position: fixed;
	background: #777;
	padding-top:85px;
	transition: all 0.5s ease;
	-webkit-transition: all 0.5s ease;
	z-index:1003;
}
nav:after {
	content:'';
	position:absolute;
	top:0;
	width:100%;
	height:55px;
	background:#666;
}
nav ul {
  position:relative;
}
nav ul li {
	padding:10px;
	cursor: pointer;
	position:relative;
  transition: all 0.5s ease;
	-webkit-transition: all 0.5s ease;
}
/* TEST NAV */
nav ul li [class*="entypo-"] {
  display: inline;
  font-size: 30px;
  position:relative;
  left:15px;
  transition: all 0.5s ease;
  -webkit-transition: all 0.5s ease;
}
nav ul .menu-item {
  display:none;
  padding-left:10px;
  font-size:11px;
  text-transform:uppercase;
}
nav:hover ul [class*="entypo-"] {
  left:0;
  font-size:15px;
}
/* TEST NAV END */
nav ul li:hover {
	background: crimson;
}
nav ul li:hover:before {
  content: '';
  border-color: transparent #EEE transparent transparent ;
  right: 0;
  border-width:10px;
  position: absolute;
  border-style: solid;
  top: 8px;
}
nav a:link, nav a:visited, nav a:active, nav a:hover {
	color:#EEE;
}
/* NAVIGATION SUB MENU */

nav .subnav {
  display:none;
  background:#666;
}
nav .subnav li {
  padding:10px;
  font-size:10px;
  text-transform:uppercase;
}
nav .subnav li:hover {
  background: crimson;
  border-left: 10px solid #B31131;
}
nav .subnav li:hover:before {
  top: 6px;
}
nav .subnav li [class*="entypo-"] {
  top:0;
  left:0;
  font-size:11px;
}
/* HEADER USERPANEL */

header .userpanel{
  width: 280px;
  height: 100%;
  position: absolute;
  top: 0;
  right: 50px;
  background: #373939;
  cursor: pointer;
  z-index: 100;
}
header .userpanel .user {
  width:100%;
  height:100%;
  position:relative;
  text-align:center;
  color:white;
}
header .userpanel .user > div:nth-child(-n+2) {
  border-right: 2px solid #333;
}
header .userpanel .notification {
  width:60px;
  height:100%;
  line-height:60px;
  float:left;
  display:block;
  position:relative;
}
header .userpanel .notification [class*="entypo-"] {
  font-size:17px;
  margin-right:13px;
}
header .userpanel .notification .number {
width: 20px;
height: 20px;
background: #2890E6;
border-radius: 5px;
line-height: 20px;
position: absolute;
top: 12px;
right:14px;
z-index: -1;
}
header .userpanel .picture {
  width:60px;
  height:100%;
  line-height:55px;
  float:left;
  display:block;
  position:relative;
}
header .userpanel .picture img {
  width:100%;
  height:100%;
  padding:5px;
  border-radius:7px;
  overflow:hidden;
  filter: grayscale(0.8);
  -webkit-filter: grayscale(0.8);
}
header .userpanel .picture img:hover {
  filter: grayscale(0);
  -webkit-filter: grayscale(0);
}
header .userpanel .name {
  width:160px;
  height:100%;
  line-height:55px;
  float:left;
  display:block;
  position:relative;
  text-align:left;
  padding:0 10px;
}
header .userpanel .name [class*="entypo-"] {
  position: absolute;
  font-size:20px;
  right:15px;
  transition: all 0.5s ease;
  -webkit-transition: all 0.5s ease;
}
header .userpanel .drop {
  width:160px;
  min-height:100px;
  display:none;
  position:absolute;
  top:55px;
  right:0;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
  background:crimson;
}
header .userpanel .drop:before {
  content:'';
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 9px solid crimson;
  left: 15px;
  top:-8px;
  position:absolute;
}
/* CONTENT */

.main-content {
  height: calc(100% - 55px);
  margin-left:80px;
   transition: all 0.5s ease;
  -webkit-transition: all 0.5s ease;
}
.container {
  width: 100%;
  height:100%;
  display: inline-block;
  margin-top: 55px;
  padding: 15px;
  background:#EEE;
}
.nav-hover {
  width:150px;
}
.push {
  margin-left:150px;
}
.arrow {
  transform:rotate(180deg);
  -webkit-transform:rotate(180deg);
  -moz-transform:rotate(180deg);
}
.active {
  background:#B31131!important;
}
!

JS 

              
                // Side Menu

$(document).ready(function(){
$('nav').hover(function(e){
  e.preventDefault();
  e.stopPropagation();
    $('nav').addClass('nav-hover');
    $('.main-content').addClass('push');
    $('nav ul .menu-item').stop().fadeIn(1200);
},function(){
    $('.subnav').fadeOut('fast');
    $('.menu-item').hide();
    $('nav').removeClass('nav-hover');
    $('.main-content').removeClass('push');
 
});
  
// Display Sub Menu
  
  $('nav ul .has-sub').click(function(e){
    e.preventDefault();
    e.stopPropagation();
    $('.subnav').filter(':not(:animated)').slideToggle();
  });
  
// Header User Panel
  
 $('header .userpanel .name').click( function(e){
          e.preventDefault();
          e.stopPropagation();
        $('header .userpanel .name').toggleClass('active');
        $('header .userpanel .name span').toggleClass('arrow');
        $("header .userpanel .drop").stop().fadeToggle(500); 
    });
$('.main-content').click( function(){
        $('header .userpanel .name').removeClass('active');
        $('header .userpanel .name span').removeClass('arrow');
        $("header .userpanel .drop").filter(':not(:animated)').fadeOut();
    });
 
// Container Scroll Bar
  
   $("html").niceScroll({styler:"fb",cursorcolor:"#e8403f", cursorwidth: '6', cursorborderradius: '10px', background: '#404040', spacebarenabled:false,  cursorborder: '', zindex: '1000'});
});
!
999px

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