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              <div id="SlideMenu">
  <ul class="nav">
    <li><a href="javascript:void(0);">Home</a></li>
    <li><a href="https://twitter.com/GenkiHagata">Twitter</a></li>
    <li><a href="https://gist.github.com/hagata/0c270504e92387e277e5">Gist</a></li>
  </ul>
</div>

<div class="center">
  <h1>Click to open the side menu</h1>
  
<svg id="MenuToggle" onClick="openMenu()" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 318 258.7" enable-background="new 0 0 318 258.7"><path stroke="#fff" stroke-miterlimit="10" d="M62.4 50.8h193.2V79H62.4zM62.4 116.3h193.2v28.2H62.4zM62.4 179.7h193.2v28.2H62.4z"/></svg>
</div>






            
          
!
            
              
/* Important Variables */
$base-curve: cubic-bezier(.17,.67,.57,.86);
$base-transition: all 100ms $base-curve;

//The non-name parts that add the curve and other properties
$base-animation: infinite $base-curve alternate forwards;

/* Mixins */
//a simple size mixin
@mixin size($size){
	height:$size;
	width:$size;
}
 
//Sets the transformation origin, especially useful for scales, and rotations
//e.g.,
//@import origin(50%,50%); //for center origin
@mixin origin($originX, $originY){
	-webkit-transform-origin:$originX $originY;
	transform-origin:$originX $originY;
}

//Uniform X,Y scale
//e.g.,
// @import scale(1.5) //makes the size 150%, remember scale 1 is the "normal" size
@mixin scale($scale){
	-webkit-transform:scaleX($scale) scaleY($scale);
	transform:scaleX($scale) scaleY($scale);
}

/* ====================================== */
/* ======= Sample base transform ======= */
/* ====================================== */
#MenuToggle{
  @include size(48px);
  transition:$base-transition;
  cursor:pointer;
  
  &:hover{
    @include scale(1.1);
    fill:teal;
  }
  
}


/* ====================================== */
/* Keyframe Animation */
/* ====================================== */

#SlideMenu{
  width:240px;
  height:100%;
  position: fixed;
  left:0; top:0;
  background:teal;
  z-index:100;
  opacity:.5;
  transform:translateX(-100%)
}


.slideInFromLeft{
	animation: slideLeft 200ms $base-animation;
	animation-iteration-count: 1;
	
}



/*============================================== */
/* ======  @Keyframe Animation Definition ====== */
/* ============================================= */

/* The Keyframe mixin */
@mixin slide-in-x($origin,$destination){
	0%{
		transform:translateX($origin);
		opacity: 0;
	}
  95%{
    transform:translateX($destination+10px);
    opacity:1
  }
	100%{
		transform:translateX($destination);
		opacity: 1;
	}
}

/* The @keyframe call */
@keyframes slideLeft{
	@include slide-in-x(-200px,-10px);
}	 







/* Page Styling */
body{
  box-sizing:border-box;
  font-family:'Roboto';
  color:#545454;
}
.center{
  width:30em;
  margin:0 auto;
  text-align:center;
}

#SlideMenu ul{
  margin-left:1em;
  padding:1em;
  
  li{
    list-style:none;
    line-height:1.2;
    margin-bottom:1em;
    
  }
  a{
    color:white;
    text-decoration:none;
    font-size:1.2em;
  }

}

            
          
!
            
              
	var menu = document.getElementById("SlideMenu");

	openMenu = function(){
		menu.classList.toggle("slideInFromLeft");

	}

            
          
!
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