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HTML

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About the <head>

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Insecure Resource

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="page-wrap">
  <button class="offcanvas-toggle">Open offcanvas here</button>

  <h1>Simple HTML, LESS, jQuery responsive offcanvas navigation menu</h1>
  
  <p>This is simple offcanvas navigation menu build on HTML, LESS and jQuery. You can use it as a starter offcanvas template for your next project. If you want to see compiled version of LESS just click on <i>"View Compiled"</i> button in CSS section. In CSS there are comments that highlight what's important to include. There is a full tutorial on how to use this offcanvas navigation menu at slicejack.com/blog, just click on button bellow to read full article.</p>

  <a href="http://slicejack.com/simple-html-less-jquery-responsive-offcanvas-navigation-menu/" class="btn" target="_blank">Read more on Slicejack.com</a>
</div><!-- /.page wrap -->

<div class="offcanvas">
  <ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">Blog</a></li>
    <li><a href="#">About us</a></li>
    <li><a href="#">Contact</a></li>
    <li><a href="#">Twitter</a></li>
  </ul>
</div><!-- /.offcanvas -->
!

CSS 

              
                /*
 * Body & Main styles
 */

@primary-color: #ffd200;
@secondary-color: #00174f;

body{ 
  color: #fff;
  background-color: @secondary-color;  
  font-family: 'Open sans', Helvetica, sans-serif;
  
  /* This is !important to include */
  overflow: hidden;
}

h1{
  font-size: 45px;
  color: @primary-color;
}

p, a{
  font-size: 17px;
  line-height: 29px;
  font-weight: 300;
  letter-spacing: 0.5px;
}

.btn{
  background-color: @primary-color;
  color: @secondary-color;
  display: inline-block;
  text-decoration: none;
  padding: 13px 30px;
  margin: 30px 0 0 0;
  border-radius: 3px;
  font-weight: bold;
  .transition;
  
  &:hover{
    background-color: #fff;
  }
}

/*
 * Transitions
 */

.transition{
  /* This is !important to include */
  -webkit-transition: -webkit-transform .2s; 
  -webkit-transition: all 200ms ease-in-out;
  transition: all 200ms ease-in-out;
}

/*
 * Page wrap
 */

.page-wrap{
  padding: 50px 60px;
  overflow: hidden;
  
  /* This is !important to include */
  .transition;
}

.offcanvas-expanded{
  .page-wrap{
    /* This is !important to include */
    -webkit-transform: translateX(320px); 
    -ms-transform: translateX(320px); 
    transform: translateX(320px);
  }
}

/*
 * Offcanvas
 */

.offcanvas{
  /* This is !important to include */
  width: 320px; 
  height: 100%;
  position: fixed;
  top: 0;
  bottom: 0;
  background: #fff; 
  z-index: 5000;
  -webkit-transform: translateX(-320px); 
  -ms-transform: translateX(-320px); 
  transform: translateX(-320px);
  .transition;
  
  ul{
    list-style: none;
    margin: 55px 0 0 0;
    
    li{
      margin: 30px 0;
      
      a{
        color: #000;
        text-decoration: none;
        text-transform: uppercase;
        font-weight: bold;
      }
    }
  }
}

.offcanvas-expanded{
  .offcanvas{
    /* This is !important to include */
    -webkit-transform: translateX(0); 
    -ms-transform: translateX(0); 
    transform: translateX(0);
  }
}

/*
 * Offcanvas toggle
 */

.offcanvas-toggle{
  background-color: transparent;
  border: 0;
  color: #fff;
  
  &:focus{
    outline: none;
  }
  
  &:before{
    content: '\f0c9';
    font-family: 'FontAwesome';
    margin: 0 20px 0 0;
  }
}
!

JS 

              
                // Adding class to body to expand offcanvas from its default state

$('.offcanvas-toggle').on('click', function() {
  $('body').toggleClass('offcanvas-expanded');
});
!
999px

Console