Pure CSS Slide Out Menu

index.html

<div class="menu">
    <div class="title">MENU</div>
    <ul class="nav">
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Work</a></li>
      <li><a href="#">Resources</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
</div>

<div class="intro">
  Hover over the menu. Thanks for visiting homie.
</div>

pure-css-slide-out-menu.markdown

Pure CSS Slide Out Menu

A simple slide out menu using just css.

A Pen by Max Kurapov on CodePen.

License.

script.js

// Hey.

style.scss

@mixin vertical-align($position) {
  position:$position;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

@mixin all-transition($time)
{
	transition: all $time;
	-webkit-transition: all $time;
}
body
{
	margin: 0;
  font-family: 'Muli', sans-serif;
}
.menu {

	font-weight: 100;
	background: #efefef;
	width: 150px;
	height: 100%;
	padding-left: 50px;
	position: fixed;
	z-index: 100;
	-webkit-box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.2);
	box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.2);
	right: -130px;
	@include all-transition(0.3s);
	color: #222;

	&:hover, &:focus
	{
		transform: translate3d(-130px, 0, 0);
		animation-timing-function: 1s ease-in;
	}
	.title
	{
		top:50%;
		@include vertical-align(absolute);
		transform: rotate(270deg);
		left: 10px;
		font-weight: 800;
		font-size: 15px;

	}
	.nav
	{
		@include vertical-align(absolute);
    font-weight: 100;

		li
		{
				padding-bottom: 30px;
				list-style-type: none;

				a
				{
					display: block;
					text-decoration: none;
					color: inherit;
					@include all-transition(0.3s);

					&:hover
					{
						color: #aaa;
					}
				}
		}


	}


}
.intro
{
	position: absolute;
	top:30%;
	width: 45%;
	margin: 0 auto;left:0;right:0;
	font-size: 45px;
	text-align: center;
   font-style: italic;

}

styles

<link href="https://fonts.googleapis.com/css?family=Muli:400,300italic,300" rel="stylesheet" />

This navigation is awesome on desktop but isn't working on mobile. Do I need a media query?