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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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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

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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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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HTML 

              
                <link href='https://fonts.googleapis.com/css?family=Oswald:400,700' rel='stylesheet' type='text/css'>
<div class="tabs-menu">
  <nav>
    <ul>
      <li class="img1 active" id="1"><a href="#"><h2>Spider-Man</h2><span class="logo"></span></a></li>
      <li class="img2" id="2"><a href="#"><h2>The Avengers</h2><span class="logo"></span></a></li>
      <li class="img3" id="3"><a href="#"><h2>Captain America</h2><span class="logo"></span></a></li>
      <li class="img4" id="4"><a href="#"><h2>Iron Man</h2><span class="logo"></span></a></li>
    </ul>
  </nav>
  
	<div class="content">
    <div class="wrapper">
    <div>
      <img class="ac-img img1" src="http://i.annihil.us/u/prod/marvel/i/mg/1/03/5226155a7157a.jpg"/>
    </div>
    <div>
      <img class="ac-img img2" src="http://i.annihil.us/u/prod/marvel/i/mg/5/50/5220c5f104d3a.jpg"/>
    </div>


    <div>
      <img class="ac-img img3" src="http://i.annihil.us/u/prod/marvel/i/mg/5/d0/5342fc0f31d34.jpg"/>
    </div>


    <div>
      <img class="ac-img img4" src="http://i.annihil.us/u/prod/marvel/i/mg/6/30/522de9bf71205.jpg"/>
    </div>
  </div>
  </div>
			
</div>
!

CSS 

              
                html, body{
  margin:0 auto;
  background: #e74c3c;
  color: #333;
  font-family: 'Oswald'
}

a{
  text-decoration:none;
  cursor:pointer;
  color: #333;
}

body{
  max-width:920px;
}


@media screen and (max-width: 399px) {
  .content, body{width:350px;}
  .wrapper div img{height:200px;}
 .tabs-menu nav li h2 {
    display:none;
  }
  .tabs-menu nav li span{
    margin:20px auto;
  }
}
@media screen and (min-width: 400px) and (max-width: 699px) {
  .content, body{width:400px;}
  .tabs-menu nav li h2 {
    display:none;
  }
  .tabs-menu nav li span{
    margin:20px auto;
  }
}
@media screen and (min-width: 700px) and (max-width: 899px) {
  .content, body{width:700px;}
  
}
@media screen and(min-width: 900px) {
  .content, body{width:900px;}
}
h2{
  margin:0;
  padding:0;
}

img{
  max-width:100%;
  height: auto;
}

.tabs-menu nav ul{
  width:100%;
  height: auto;
}

nav{
  width:100%;
  height:90px;
  margin: 0 auto;
  overflow:hidden;
}

ul {
  list-style: none;
  padding: 0;
}
nav li {
  float: left;
  height: 120px;
  margin: 5px 3px;
  padding: 0 20px;
  position: relative;
  background: white;
  border-radius: 30px;
}
nav li:first-child{margin-left:0;}

nav li span{
  margin: 0 auto;
}

.active a{ color: #e74c3c;}
.active span.logo{ background-color: #e74c3c; border-radius:99px;}
span.logo{
  width:40px;
  height:40px;
  display:block;
}
.img1 .logo{
  background: url('http://www.clker.com/cliparts/e/c/a/9/13683718001003283990windows_8_icons_superheroes.png') -54px -48px;
  width:30px;
  height:30px;
}

.img2 .logo{
  background: url('http://www.clker.com/cliparts/e/c/a/9/13683718001003283990windows_8_icons_superheroes.png') -283px -48px;
  width:30px;
  height:30px;
}

.img3 .logo{
  background: url('http://www.clker.com/cliparts/e/c/a/9/13683718001003283990windows_8_icons_superheroes.png') -146px -48px;
  width:30px;
  height:30px;
}

.img4 .logo{
  background: url('http://www.clker.com/cliparts/e/c/a/9/13683718001003283990windows_8_icons_superheroes.png') -8px -140px;
  width:30px;
  height:30px;
}

.content{
  clear:both;
  overflow: hidden;
  border:5px solid white;
  z-index:10;
  width:100%;
  height:auto;
  background:white;
}
.wrapper{
  z-index:5;
  position: relative;
  left:0;
}
.wrapper div{
  position:relative;
  float:left;
  z-index:1;
  
}
.wrapper div img{
  width:100%;
  height:auto;

}
!

JS 

              
                $(function() {
  var total = $("body").width();
  var total2 = total;
  var ancho = total*4;
  $(".ac-img").css("width", total+"px");
  $(".wrapper").css({"width":ancho+"px"});
  var tabs =  $(".tabs-menu li");
  
  $( window ).resize(function() {
    var total2 = $("body").width();
    var ancho2 = total2*4;
    $(".ac-img").css("width", total2+"px");
    $(".wrapper").css({"width":ancho2+"px"});
    var clase2 = $(".active").attr("id");
    $(".wrapper").stop().animate({
      left: -(total2*(clase2-1)),
    }, 100);
  });
  
  $('nav ul li').click(function() {
    var total = $("body").width();
    
    var clase = $(this).attr("id");
    tabs.removeClass("active");
    $(this).addClass("active");
    $(".wrapper").stop().animate({
      left: -(total*(clase-1)),
    }, 1000);
    
  });
   
});
!
999px

Console