Diviser une page web en deux ( menu et entete de page )

bonsoir a tous et toutes.
je viens vers vous ce soir pour solliciter votre aide car je souhaite diviser une page web en deux soit le menu et l'entete de page , je reussi a le faire mais je rencontre un probleme de css.
Pièce jointe 253981
voici la page deja presque decoupe mais si je retire le bouton open en close j'obtien ceci.
il devien timplossible pour moi d'acceder a mon menu.
Pièce jointe 253986
je pense que le probleme doit etre dans le css mais je ne sais ou.
voici mon fichier html et css.

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<!DOCTYPE html>
<html lang="en" class="no-js">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
		<meta name="viewport" content="width=device-width, initial-scale=1.0"> 
		<title>ETECH KEYS SMS/USSD </title>
		<meta name="description" content="Plate Forme de Gestion des Pull, Push et Bulk SMS d' ETECH KEYS" />
		<meta name="keywords" content="Plate Forme de Gestion des Pull, Push et Bulk SMS d' ETECH KEYS" />
		<meta name="author" content="Codrops" />
		<link rel="shortcut icon" href="../favicon.ico">
		<link rel="stylesheet" type="text/css" href="css/normalize.css" />
		<link rel="stylesheet" type="text/css" href="css/demo.css" />
		<link rel="stylesheet" type="text/css" href="css/icons.css" />
		<link rel="stylesheet" type="text/css" href="css/component.css" />
		<script src="js/modernizr.custom.js"></script>
	</head>
	<body>
 
	<?php
	$error = '';
 
	if(isset($_GET['ac']) && $_GET['ac'] == 'logout'){
		$_SESSION['user_info'] = null;
		unset($_SESSION['user_info']);
	}
?>
		<div class="container">
			<!-- Push Wrapper -->
			<div class="mp-pusher" id="mp-pusher">
 
				<!-- mp-menu -->
				<nav id="mp-menu" class="mp-menu">
					<div class="mp-level">
						<h3 class="icon icon-world">TABLEAU DE BORD</h3>
						<ul>
							<li><a class="icon icon-user" href="#">Profil Utilisateur</a></li>
							<li><a class="icon icon-phone" href="#">Groupe</a></li>
							<li class="icon icon-arrow-left">
								<a class="icon icon-display" href="#">Contact</a>
								<div class="mp-level">
									<h2 class="icon icon-display">Contact</h2>
									<ul>
										<li><a class="icon icon-phone" href="#">Importer</a></li>
										<li><a class="icon icon-shop" href="#">Gerer</a></li>										
 
									</ul>
								</div>
							</li>
							<li class="icon icon-arrow-left">
								<a class="icon icon-news" href="#">SMS</a>
								<div class="mp-level">
									<h2 class="icon icon-news">SMS</h2>
									<ul>
										<li><a class="icon icon-shop" href="#">SMS Simple</a></li>
										<li><a class="icon icon-diamond" href="#">SMS Groupé</a></li>
										<li><a class="icon icon-heart" href="#">SMS Personalisé</a></li>
										<li><a class="icon icon-cloud" href="#">SMS Programmé</a></li>
 
									</ul>
								</div>
							</li>
							<li><a class="icon icon-banknote" href="#">Parametrage</a></li>
							<li><a class="icon icon-photo" href="#">Transaction</a></li>
							<li><a class="icon icon-data" href="reporting/reporting.htm">Reporting</a></li>
							<li><a class="icon icon-location" href="index.php?ac=logout">Deconnexion</a></li>
						</ul>
					</div>
				</nav>
				<!-- /mp-menu -->
 
				<div class="scroller"><!-- this is for emulating position fixed of the nav -->
					<div class="scroller-inner">
						<!-- Top Navigation -->
						<div class="codrops-top clearfix">
							 <!-- <a class="codrops-icon codrops-icon-prev" href="http://tympanus.net/Tutorials/CircularNavigation/"><span>Previous Demo</span></a> 
							<span class="right"><a class="codrops-icon codrops-icon-drop" href="http://tympanus.net/codrops/?p=16252"><span>Back to the Codrops Article</span></a></span> -->
						</div>
						<header class="codrops-header">
							<h1>Plate Forme de Gestion  </h1>  <!-- <br> Retour a la Ligne -->
						</header>
 
					</div><!-- /scroller-inner -->
				</div><!-- /scroller -->
 
			</div><!-- /pusher -->
		</div><!-- /container -->
		<script src="js/classie.js"></script>
		<script src="js/mlpushmenu.js"></script>
		<script>
			new mlPushMenu( document.getElementById( 'mp-menu' ), document.getElementById( 'trigger' ) );
		</script>
	</body>
</html>

css

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*,
*:after,
*::before {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
 
html, body, .container, .scroller {
	height: 100%;
}
 
.scroller {
	overflow-y: scroll;
}
 
.scroller,
.scroller-inner {
	position: relative;
 
}
 
.container {
	position: relative;
	overflow: hidden;
}
 
.menu-trigger {
	position: relative;
	padding-left: 60px;
	font-size: 0.9em;
}
 
.menu-trigger:before {
	position: absolute;
	top: 2px;
	left: 0;
	width: 40px;
	height: 6px;
	background: #777;
	box-shadow: 0 6px #eee, 0 12px #777, 0 18px #eee, 0 24px #777;
	content: '';
}
 
.mp-pusher {
	position: relative;
	left: 0;
	height: 100%;
}
 
.mp-menu {
	position: absolute; /* we can't use fixed here :( */
	top: 0;
	left: 0;
	z-index: 1;
	width: 300px;
	height: 100%;
	-webkit-transform: translate3d(-100%, 0, 0);
	-moz-transform: translate3d(-100%, 0, 0);
	transform: translate3d(-100%, 0, 0);
}
 
.mp-level {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: #336ca6;
	-webkit-transform: translate3d(-100%, 0, 0);
	-moz-transform: translate3d(-100%, 0, 0);
	transform: translate3d(-100%, 0, 0);
}
 
/* overlays for pusher and for level that gets covered */
.mp-pusher::after,
.mp-level::after,
.mp-level::before {
	position: absolute;
	top: 0;
	right: 0;
	width: 0;
	height: 0;
	content: '';
	opacity: 0;
}
 
.mp-pusher::after,
.mp-level::after {
	background: rgba(0,0,0,0.3);
	-webkit-transition: opacity 0.3s, width 0.1s 0.3s, height 0.1s 0.3s;
	-moz-transition: opacity 0.3s, width 0.1s 0.3s, height 0.1s 0.3s;
	transition: opacity 0.3s, width 0.1s 0.3s, height 0.1s 0.3s;
}
 
.mp-level::after {
	z-index: -1;
}
 
.mp-pusher.mp-pushed::after,
.mp-level.mp-level-overlay::after {
	width: 100%;
	height: 100%;
	opacity: 1;
	-webkit-transition: opacity 0.3s;
	-moz-transition: opacity 0.3s;
	transition: opacity 0.3s;
}
 
.mp-level.mp-level-overlay {
	cursor: pointer;
}
 
.mp-level.mp-level-overlay.mp-level::before {
	width: 100%;
	height: 100%;
	background: transparent;
	opacity: 1;
}
 
.mp-pusher,
.mp-level {
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
	transition: all 0.5s;
}
 
/* overlap */
.mp-overlap .mp-level.mp-level-open {
	box-shadow: 1px 0 2px rgba(0,0,0,0.2);
	-webkit-transform: translate3d(-40px, 0, 0);
	-moz-transform: translate3d(-40px, 0, 0);
	transform: translate3d(-40px, 0, 0);
}
 
/* First level */
.mp-menu > .mp-level,
.mp-menu > .mp-level.mp-level-open,
.mp-menu.mp-overlap > .mp-level,
.mp-menu.mp-overlap > .mp-level.mp-level-open {
	box-shadow: none;
	-webkit-transform: translate3d(0, 0, 0);
	-moz-transform: translate3d(0, 0, 0);
	transform: translate3d(0, 0, 0);
}
 
/* cover */
.mp-cover .mp-level.mp-level-open {
	-webkit-transform: translate3d(0, 0, 0);
	-moz-transform: translate3d(0, 0, 0);
	transform: translate3d(0, 0, 0);
}
 
.mp-cover .mp-level.mp-level-open > ul > li > .mp-level:not(.mp-level-open) {
	-webkit-transform: translate3d(-100%, 0, 0);
	-moz-transform: translate3d(-100%, 0, 0);
	transform: translate3d(-100%, 0, 0);
}
 
/* content style */
.mp-menu ul {
	margin: 0;
	padding: 0;
	list-style: none;
}
 
.mp-menu h2 {
	margin: 0;
	padding: 1em;
	color: rgba(0,0,0,0.4);
	text-shadow: 0 0 1px rgba(0,0,0,0.1);
	font-weight: 300;
	font-size: 2em;
}
 
.mp-menu.mp-overlap h2::before {
	position: absolute;
	top: 0;
	right: 0;
	margin-right: 8px;
	font-size: 75%;
	line-height: 1.8;
	opacity: 0;
	-webkit-transition: opacity 0.3s, -webkit-transform 0.1s 0.3s;
	-moz-transition: opacity 0.3s, -moz-transform 0.1s 0.3s;
	transition: opacity 0.3s, transform 0.1s 0.3s;
	-webkit-transform: translateX(-100%);
	-moz-transform: translateX(-100%);
	transform: translateX(-100%);
}
 
.mp-menu.mp-cover h2 {
	text-transform: uppercase;
	font-weight: 700;
	letter-spacing: 1px;
	font-size: 1em;
}
 
.mp-overlap .mp-level.mp-level-overlay > h2::before {
	opacity: 1;
	-webkit-transition: -webkit-transform 0.3s, opacity 0.3s;
	-moz-transition: -moz-transform 0.3s, opacity 0.3s;
	transition: transform 0.3s, opacity 0.3s;
	-webkit-transform: translateX(0);
	-moz-transform: translateX(0);
	transform: translateX(0);
}
 
.mp-menu ul li > a {
	display: block;
	padding: 0.7em 1em 0.7em 1.8em;
	outline: none;
	box-shadow: inset 0 -1px rgba(0,0,0,0.2);
	text-shadow: 0 0 1px rgba(255,255,255,0.1);
	font-size: 1.4em;
	-webkit-transition: background 0.3s, box-shadow 0.3s;
	-moz-transition: background 0.3s, box-shadow 0.3s;
	transition: background 0.3s, box-shadow 0.3s;
}
 
.mp-menu ul li::before {
	position: absolute;
	left: 10px;
	z-index: -1;
	color: rgba(0,0,0,0.2);
	line-height: 3.5;
}
 
.mp-level > ul > li:first-child > a {
	box-shadow: inset 0 -1px rgba(0,0,0,0.2), inset 0 1px rgba(0,0,0,0.2);
}
 
.mp-menu ul li a:hover,
.mp-level > ul > li:first-child > a:hover {
	background: rgba(0,0,0,0.2);
	box-shadow: inset 0 -1px rgba(0,0,0,0);
}
 
.mp-menu .mp-level.mp-level-overlay > ul > li > a,
.mp-level.mp-level-overlay > ul > li:first-child > a {
	box-shadow: inset 0 -1px rgba(0,0,0,0);
}
 
.mp-level > ul > li:first-child > a:hover,
.mp-level.mp-level-overlay > ul > li:first-child > a {
	box-shadow: inset 0 -1px rgba(0,0,0,0), inset 0 1px rgba(0,0,0,0);
} /* seems like Chrome 34.0.1847.131 needs the second shadow otherwise the transition breaks */
 
.mp-back {
	background: rgba(0,0,0,0.1);
	outline: none;
	color: #fff;
	text-transform: uppercase;
	letter-spacing: 1px;
	font-weight: 700;
	display: block;
	font-size: 0.8em;
	padding: 1em;
	position: relative;
	box-shadow: inset 0 1px rgba(0,0,0,0.1);
	-webkit-transition: background 0.3s;
	-moz-transition: background 0.3s;
	transition: background 0.3s;
}
 
.mp-back::after {
	font-family: 'linecons';
	position: absolute;
	content: "\e037";
	right: 10px;
	font-size: 1.3em;
	color: rgba(0,0,0,0.3);
}
 
.mp-menu .mp-level.mp-level-overlay > .mp-back,
.mp-menu .mp-level.mp-level-overlay > .mp-back::after {
	background: transparent;
	box-shadow: none;
	color: transparent;
}
 
/* Fallback example for browsers that don't support 3D transforms (and no JS fallback) */
/* We'll show the first level only */
.no-csstransforms3d .mp-pusher,
.no-js .mp-pusher {
	padding-left: 300px;
}
 
.no-csstransforms3d .mp-menu .mp-level,
.no-js .mp-menu .mp-level {
	display: none;
}
 
.no-csstransforms3d .mp-menu > .mp-level,
.no-js .mp-menu > .mp-level {
	display: block;
}

Merci d'avance .