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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.

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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-.

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JavaScript

About JavaScript Preprocessors

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 class="mobilMenu"><i class="fa fa-bars"></i></div>
        <div class="menu">
            <div class="logo"><a href=""><img src="https://dummyimage.com/100x100/ff6347/fff&text=db" alt="" /></a>
            </div>
            <div class="menuContainer">
                <div class="menuItem"><span>Home</span></div
                ><div class="menuItem"><span>Repudiandae<i class="fa fa-angle-down sumenuIcon"></i></span>
                    <div class="submenuItem">
                        <div>Looorem ipsum dolor sit amet, consectetur adipisicing elit. Ad, beatae voluptatum modi totam iusto molestias quaerat, praesentium atque cum, eveniet quis optio reiciendis odio a facere! Laudantium possimus maiores sunt sed amet repudiandae nobis et facere laboriosam? Fuga accusamus repudiandae sint vero possimus similique numquam odit perferendis quisquam porro dignissimos ducimus dolor aliquid enim, ex id obcaecati eveniet exercitationem! Eius iure, ab beatae qui vero, quia placeat iusto quidem possimus at dolores eligendi voluptatum veniam vel. Minus accusantium ad modi molestias perferendis aperiam ipsam fugiat similique corrupti temporibus alias officia veniam pariatur ipsa blanditiis praesentium, laudantium labore autem earum quisquam.</div>
                    </div>
                </div
                ><div class="menuItem"><span>Laboriosam<i class="fa fa-angle-down sumenuIcon"></i></span>
                    <div class="submenuItem">
                        <div>Quod, similique, aliquid. Enim, quae. Loreem ipsum dolor sit amet, consectetur adipisicing elit. Incidunt excepturi, distinctio possimus, consequuntur illum deserunt ipsa? Numquam aliquid sapiente fuga eum? Laboriosam vel id alias sed optio maiores odio ipsum temporibus, aliquam magni adipisci, expedita, asperiores facere eos minima possimus, rem ea repudiandae? Nihil, quidem similique. Blanditiis quasi laboriosam possimus et, quod dolor reprehenderit, nisi eligendi vel! Assumenda asperiores cumque quasi tenetur dolor atque, dignissimos ad veritatis voluptate. Eveniet, soluta, iusto. Temporibus optio magni totam voluptates iusto ipsum laboriosam itaque debitis, fugiat harum, sed hic reprehenderit fuga quidem, ipsam placeat molestias consectetur molestiae architecto suscipit.</div>
                    </div>
                </div
                ><div class="menuItem"><span>Praesentium</span></div
              ><div class="menuItem"><span>Soluta tenetur</span></div
              ><div class="menuItem"><span>Assumenda</span></div>
            </div>
        </div>
    <div class="wrapper">
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Reiciendis, amet eius tempora praesentium accusantium aperiam obcaecati, ipsam atque ducimus laborum voluptatem, consequuntur fuga necessitatibus fugit quisquam quam. Corporis, iste corrupti commodi, aliquam soluta est facilis asperiores praesentium ut nulla esse recusandae perferendis iure temporibus quae, necessitatibus nesciunt a architecto aliquid ullam. Placeat odit quisquam nobis adipisci voluptate nemo earum deleniti. Voluptas illum, adipisci molestiae consequatur, quo similique quae aliquam, architecto repudiandae nisi impedit doloribus incidunt voluptatum aspernatur dolorem sequi asperiores ratione rerum libero doloremque! Tenetur nihil quos iure ex accusantium id dolores vitae eveniet numquam porro architecto, reiciendis, voluptatibus quisquam?</p>
    </div>
!

CSS 

              
                * {
  border: 0;
  padding: 0;
  margin: 0;
  outline: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  list-style: none;
}

body {
  background-color: #eee;
  font-family: Arial, Verdana, Helvetica;
  font-size: 14px;
  line-height:20px;
  text-align:justify;
}

.logo {
  display: block;
  position: absolute;
  padding: 8px 20px;
  z-index: 1;
}

.logo img {
  max-height: 28px;
}

.wrapper {
  max-width:960px;
  margin: 0 auto;
  padding: 20px;
}

.menu {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    position: relative;
    margin-top:20px;
}

p {
  padding-bottom: 16px;
}
.menuContainer {
    position: relative;
    width: 100%;
    background-color: #333;
    text-align: right;
}
.menuItem {
    display: inline-block;
    background-color: #333;
    color: #fff;
    padding: 10px 15px;
    cursor: pointer;
    text-align: left;
}
.menuItem:hover {
    background-color: #ff6347;
}
.submenuItem {
    position: absolute;
    top: 40px;
    width: 100%;
    max-width: 960px;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    border-bottom: 1px solid #ddd;
    background-color: #fff;
    color: #333;
    padding: 20px;
}
.mobilMenu {
    display: none;
}

.sumenuIcon {
  padding-left: 5px;
}

@media (max-width: 768px) {
  
    .wrapper {
      padding-top: 60px;
    }
  
    .logo {
      padding: 8px 20px;
    }
  
  .menu {
    margin-top:0;
  }
  
    .mobilMenu {
        display: block;
        position: absolute;
        right: 0;
        top: 0;
        width: 100%;
        background-color: #333;
        height:40px;
        color: #fff;
        cursor: pointer;
        text-align: right;
    		padding: 10px 20px;
    }

    .menuItem {
          display: block;
          height: auto;
          padding: 10px 0;
    }
    
    .menuItem span {
        padding: 10px 20px;
    }
    
    .menuContainer {
        position: absolute;
        top:40px;
        width: 100%;
    }
    .submenuItem {
        position: relative;
        top: 10px;
        width: 100%;
        max-width: 960px;
        background-color: #fff;
        left: 0;
        right: 0;
        margin: auto;
    }
  
    .sumenuIcon {
      position:absolute;
      display: inline;
      right:21px;
      padding-top: 3px;
    }
}
!

JS 

              
                    function windowSize(){
        var oldWidth = 999999;
        var width = 0;
        $(window).on('resize',function(){
            $('#wrapper').height($('body').height());
            if($(window).width() != width){
                width = $(window).width();
            }
            if(width > 751){ /* Normal - 17px scrollbar */
                $('.menuContainer').slideDown(0);
                $('.mobilMenu').attr('status-id','1');
            }
            else{
                if(oldWidth > 751){ /* Normal - 17px scrollbar */
                    $('.menuContainer').slideUp(0);
                    $('.mobilMenu').attr('status-id','0');
                }
            }
            console.log(width);
            oldWidth = width;
        })
        .trigger('resize');
    }
    
    windowSize();
    $('.mobilMenu').on('click',function(){
        if( $('.mobilMenu').attr('status-id') == 0){
            $('.menuContainer').stop().slideDown(100);
            $('.mobilMenu').attr('status-id','1');
        }
        else{
            $('.menuContainer').stop().slideUp(100);
            $('.mobilMenu').attr('status-id','0');
        }
    });
    $('.submenuItem').slideUp(0);
    $('.menuItem').on('mouseover',function(){
       $(this).children('.submenuItem').slideDown(100); 
    });
    $('.menuItem').on('mouseleave',function(){
       $(this).children('.submenuItem').slideUp(100); 
    });
!
999px

Console