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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div id="off-canvas">
<nav>
  <a href="#">Menu Item 1</a>
  <a href="#">Menu Item 2</a>
  <a href="#">Menu Item 3</a>
  <a href="#">Menu Item 4</a>
  <a href="#">Menu Item 5</a>  
</nav>
</div><!--/off-canvas-->



<header class="header">
  <h1>Simple Off Canvas Menu with jQuery</h1>  
  <button id="trigger"><i class="fa fa-bars"></i></button>
</header><!--/header-->

<section>
   <article>
     
     <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vestibulum condimentum mi et ultrices. Mauris interdum vel mauris nec mollis. Aliquam erat volutpat. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Curabitur imperdiet lacus sed lacinia dictum. Donec vel tellus nisl. Nulla aliquet orci faucibus urna condimentum dapibus. Maecenas faucibus ante ante, quis dictum enim pharetra quis. Nunc cursus ut arcu sit amet egestas. Donec rutrum sapien eget est varius, a cursus mi iaculis. Quisque in fermentum tellus. Cras sagittis dictum dictum. Donec rutrum purus neque, sodales dictum sem efficitur vitae. Nulla vitae arcu suscipit, pharetra felis et, convallis erat.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed non viverra arcu. Nullam faucibus quis eros a tempor. Sed eget purus vitae diam scelerisque mollis. Donec eleifend metus nunc, id facilisis nunc feugiat quis. Curabitur et elit lacinia, lobortis neque vitae, ultricies nunc. In id tortor et felis semper tristique. Curabitur quis scelerisque nisl. Sed vulputate ante ut tincidunt maximus. In blandit eu massa id posuere. Fusce in convallis erat. Proin dictum gravida magna. Nullam quis quam varius dui interdum lacinia eu quis eros. Nulla sit amet sagittis nisi. Duis pretium, diam in interdum convallis, arcu massa imperdiet sapien, quis ultrices libero nunc a risus.</p>

<p>Vivamus nisl enim, interdum quis tellus sed, tempor feugiat velit. Nunc a neque fringilla, vehicula nunc sed, lacinia ipsum. Praesent feugiat, ex at scelerisque egestas, arcu lorem molestie metus, eu sollicitudin nulla nunc eu est. Nullam felis ipsum, accumsan nec suscipit nec, vehicula nec ipsum. Cras pharetra eu metus sed sagittis. Nullam aliquam bibendum varius. Fusce consectetur mattis faucibus. Vivamus scelerisque non nunc et auctor. Proin volutpat posuere erat, sed condimentum sem efficitur quis. Sed a scelerisque velit. Praesent et dolor quis tellus molestie sollicitudin ut vel nunc. Nulla eget mattis nunc. Etiam pretium sed velit a blandit.</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vestibulum condimentum mi et ultrices. Mauris interdum vel mauris nec mollis. Aliquam erat volutpat. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Curabitur imperdiet lacus sed lacinia dictum. Donec vel tellus nisl. Nulla aliquet orci faucibus urna condimentum dapibus. Maecenas faucibus ante ante, quis dictum enim pharetra quis. Nunc cursus ut arcu sit amet egestas. Donec rutrum sapien eget est varius, a cursus mi iaculis. Quisque in fermentum tellus. Cras sagittis dictum dictum. Donec rutrum purus neque, sodales dictum sem efficitur vitae. Nulla vitae arcu suscipit, pharetra felis et, convallis erat.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed non viverra arcu. Nullam faucibus quis eros a tempor. Sed eget purus vitae diam scelerisque mollis. Donec eleifend metus nunc, id facilisis nunc feugiat quis. Curabitur et elit lacinia, lobortis neque vitae, ultricies nunc. In id tortor et felis semper tristique. Curabitur quis scelerisque nisl. Sed vulputate ante ut tincidunt maximus. In blandit eu massa id posuere. Fusce in convallis erat. Proin dictum gravida magna. Nullam quis quam varius dui interdum lacinia eu quis eros. Nulla sit amet sagittis nisi. Duis pretium, diam in interdum convallis, arcu massa imperdiet sapien, quis ultrices libero nunc a risus.</p>

<p>Vivamus nisl enim, interdum quis tellus sed, tempor feugiat velit. Nunc a neque fringilla, vehicula nunc sed, lacinia ipsum. Praesent feugiat, ex at scelerisque egestas, arcu lorem molestie metus, eu sollicitudin nulla nunc eu est. Nullam felis ipsum, accumsan nec suscipit nec, vehicula nec ipsum. Cras pharetra eu metus sed sagittis. Nullam aliquam bibendum varius. Fusce consectetur mattis faucibus. Vivamus scelerisque non nunc et auctor. Proin volutpat posuere erat, sed condimentum sem efficitur quis. Sed a scelerisque velit. Praesent et dolor quis tellus molestie sollicitudin ut vel nunc. Nulla eget mattis nunc. Etiam pretium sed velit a blandit.</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vestibulum condimentum mi et ultrices. Mauris interdum vel mauris nec mollis. Aliquam erat volutpat. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Curabitur imperdiet lacus sed lacinia dictum. Donec vel tellus nisl. Nulla aliquet orci faucibus urna condimentum dapibus. Maecenas faucibus ante ante, quis dictum enim pharetra quis. Nunc cursus ut arcu sit amet egestas. Donec rutrum sapien eget est varius, a cursus mi iaculis. Quisque in fermentum tellus. Cras sagittis dictum dictum. Donec rutrum purus neque, sodales dictum sem efficitur vitae. Nulla vitae arcu suscipit, pharetra felis et, convallis erat.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed non viverra arcu. Nullam faucibus quis eros a tempor. Sed eget purus vitae diam scelerisque mollis. Donec eleifend metus nunc, id facilisis nunc feugiat quis. Curabitur et elit lacinia, lobortis neque vitae, ultricies nunc. In id tortor et felis semper tristique. Curabitur quis scelerisque nisl. Sed vulputate ante ut tincidunt maximus. In blandit eu massa id posuere. Fusce in convallis erat. Proin dictum gravida magna. Nullam quis quam varius dui interdum lacinia eu quis eros. Nulla sit amet sagittis nisi. Duis pretium, diam in interdum convallis, arcu massa imperdiet sapien, quis ultrices libero nunc a risus.</p>

<p>Vivamus nisl enim, interdum quis tellus sed, tempor feugiat velit. Nunc a neque fringilla, vehicula nunc sed, lacinia ipsum. Praesent feugiat, ex at scelerisque egestas, arcu lorem molestie metus, eu sollicitudin nulla nunc eu est. Nullam felis ipsum, accumsan nec suscipit nec, vehicula nec ipsum. Cras pharetra eu metus sed sagittis. Nullam aliquam bibendum varius. Fusce consectetur mattis faucibus. Vivamus scelerisque non nunc et auctor. Proin volutpat posuere erat, sed condimentum sem efficitur quis. Sed a scelerisque velit. Praesent et dolor quis tellus molestie sollicitudin ut vel nunc. Nulla eget mattis nunc. Etiam pretium sed velit a blandit.</p>
  </article>
</section>
!

CSS 

              
                *, *:before, *:after {
  -webkit-box-sizing: border-box; 
  -moz-box-sizing: border-box; 
  box-sizing: border-box;
}

html, body{
  margin:0;
  padding:0;
  font-family:sans-serif;
}

#off-canvas{
  width:250px;
  height:100%;
  top:0;
  left:-250px;
  padding:25px;
  background:#a6032f;
  position:fixed; 
  z-index:5;
  a{
     display:block;
     color:#FFF;
     text-decoration:none;
     padding:5px 10px;
     background:#CCC;
     color:#2a4059;
     border-radius:5px;
     margin:0 0 10px;
     &:hover {
      background:#FFF;      
    }
  } 
}

#trigger{
  background:#a6032f;
  color:#FFF;
  padding:10px 15px;
  border:0;
  border-radius:5px;
  line-height:auto;
  font-size:1rem;
  margin:10px 0 0;
  text-transform:uppercase;
  cursor:pointer;
  position:absolute;
  top: 15px;
  right:25px;
  box-shadow:1px 1px 0px #000;
  &:hover {
    background:#FFF;
    color:#a6032f;
  }
}

/****HEADER****/

.header {
  background:#2a4059;
  padding:25px;
  text-align:center;
  position:relative;
  z-index:0;
  overflow:hidden;
  h1{
    margin:0;
    color:#FFF;
    max-width:70%;
    float:left;
  }
}

/****CONTENT****/

section {
  padding:25px;
}
!

JS 

              
                var x = false;

$('#trigger').on('click', function(){
  if(!x) {
    $('#off-canvas').animate({left:"0"},200);
    x = true;
  }else{
    $('#off-canvas').animate({left:"-250px"},200);
    x = false;
  } 
});
!
999px

Console