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HTML 

              
                <link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
<div class="screen"><div class="content">
  <input type="checkbox" class="check" id="check" />
  <div class="menu">
    <label for="check" class="btn"><i class="fa fa-bars"></i></label>
    <ul>
      <li><a href="#"><i class="fa fa-globe"></i>About</a></li>
      <li><a href="#"><i class="fa fa-desktop"></i>Product</a></li>
      <li><a href="#"><i class="fa fa-camera"></i>Gallery</a></li>
      <li><a href="#"><i class="fa fa-users"></i>Support</a></li>
    </ul>
  </div>
  <label for="check" class="cbtn"></label>
  <div class="contentBody">
    <h1>Dummy Text</h1>
    <p>
    Natoque facilisi diam quisque aliquam posuere. Pede dolor suspendisse faucibus, primis mi vivamus sagittis mauris tempor torquent, molestie lectus. Leo. Aptent tellus mi mauris Malesuada aenean lectus bibendum.
    </p>
    <p>
    Hac nullam. Integer integer. Facilisi donec. Venenatis Non consequat, cum accumsan. Luctus pulvinar non hendrerit per fames quis.
    </p>
    <p>
    Euismod massa aliquam diam vulputate consectetuer nostra, bibendum auctor ante. Quam. Gravida diam lobortis sapien sociis justo. Tristique augue vehicula sem condimentum euismod ornare.
    </p>
    <p>
    Et sodales elit conubia venenatis sagittis penatibus malesuada. Habitant ligula turpis nisi nulla lacus sagittis leo lorem orci torquent pulvinar rutrum habitant diam dis nibh nibh velit enim ante scelerisque.
    </p>
  </div>
  </div></div>
!

CSS 

              
                @import "compass/css3";

body {
  background-color: #666;
}
.screen {
  poisition: relative;
  width: 320px;
  height: 100%;
  margin: 0 auto;
  background-color: #fff;
  overflow: hidden;
  box-shadow:0 2px 10px rgba(#000,.5);
  @include box-sizing(border-box);
}
.content {
  position: relative;
}
.check {
  display: none;
}
$menuWidth: 250px;
.menu {
  position: absolute;
  top: 0;
  left: -$menuWidth;
  z-index:2;
  @include transition(.3s);
  animation: 2s demo 1;
  -webkit-animation: 2s demo 1;

  .btn {
    float: right;
    display: block;
    width: 40px;
    line-height: 40px;
    font-size: 24px;
    background: #333;
    color: #fff;
    text-align: center;
    cursor: pointer;
  }
  .btn:hover {
    background: #666;
  }
  ul {
    display: block;
    float:left;
     z-index: 1;
    left: -$menuWidth;
    display: block;
    background: #333;
    margin: 0;
    padding: 0;
    width:$menuWidth;
  }
  li {
    list-style: none;
    a {
      display: block;
      padding:0 10px;
      height: 40px;
      line-height: 40px;
      color: #fff;
      text-decoration: none;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    a:hover {
      background: #666;
    }
    i {
      width: 20px;
      margin-right: 10px;
      text-align: center;
    }
  }
}
.check:checked ~ .menu {
  left:0px;
}
.cbtn {
  display: none;
  position:absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(#000,.5);
  z-index: 1;
}
.check:checked ~ .cbtn {
  display: block;
}
.contentBody {
  padding: 10px;
}
.check:checked ~ .contentBody {
  -webkit-filter: blur(1px);
  filter: blur(1px);
}

h1 {
  text-align: center;
}

@keyframes demo {
  0% {left: -$menuWidth;}
  20% {left: 0;}
  80% {left: 0;}
  100% {left: -$menuWidth;}
}
@-webkit-keyframes demo {
  0% {left: -$menuWidth;}
  20% {left: 0;}
  80% {left: 0;}
  100% {left: -$menuWidth;}
}
!

JS
!
999px

Console