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HTML

About HTML Preprocessors

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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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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.

Add External Scripts/Pens

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <input id="activar" name="activar" type="checkbox">
<div class="desplegable">
  <div class="contenido">
    <!-- Cualquier contenido aquí -->
    <link href="https://fonts.googleapis.com/css?family=Oswald:400" rel="stylesheet" type="text/css" />
    <ul class="iconmenu">
      <li><a class="falink" href="https://www.linkedin.com/in/oloman">Linkedin</a></li>
      <li><a class="fagoog" href="https://plus.google.com/+Oloblogger">Google+</a></li>
      <li><a class="fatwit" href="https://twitter.com/oloblogger">Twitter</a></li>
      <li><a class="faface" href="https://www.facebook.com/oloblogger">Facebook</a></li>
    </ul>
    <!-- Fin contenido -->
  </div>
  <label class="label" for="activar"></label>
</div>
<!-- Resto de la página -->
<header>
  <div class="cabecera">
    <img src="https://1.bp.blogspot.com/-XL4Br3tCL3g/U7PfReX_VcI/AAAAAAAAQpI/BmljEZJkH44/s1200/esperando.gif" />
  </div>
  <h1>Solapa #css abatible con clic</h1>
  (Ver explicación en <a href="https://www.oloblogger.com/2015/12/ocultar-mostrar-con-css-checked.html">Oloblogger</a>)
</header>

<section>
<p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse dapibus non odio fringilla eleifend. Sed ut aliquet felis. Mauris bibendum blandit quam in tristique. Maecenas non suscipit diam. Mauris dui quam, varius id commodo a, malesuada ut justo.
  </p>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse dapibus non odio fringilla eleifend. Sed ut aliquet felis. Mauris bibendum blandit quam in tristique. Maecenas non suscipit diam. Mauris dui quam, varius id commodo a, malesuada ut justo.
    Cras eget dolor mauris. Proin at mollis diam. Nam condimentum eros ac nunc vulputate adipiscing. Ut non metus placerat, euismod nisi id, scelerisque ante. Vivamus sed nisi sit amet risus volutpat pharetra ut sit amet purus. Proin ultricies turpis
    magna, quis venenatis dolor congue vel. Mauris quis ligula elementum, sollicitudin dui vitae, pellentesque lacus. Donec vel semper nulla, et fringilla libero. Cras et leo eu arcu adipiscing lobortis eu sed felis. Quisque hendrerit consectetur lorem,
    id eleifend mauris luctus eu.
  </p>
  <p>
    <img src="http://lorempixel.com/800/400/city/10"/>
  </p>
  <p>
    Aliquam lacus lorem, mollis in pellentesque vel, elementum ac arcu. Morbi quis ullamcorper felis. Pellentesque aliquet ultricies lorem, eu sollicitudin libero rhoncus sed. Praesent porttitor tellus vehicula elit eleifend, sed aliquet felis tincidunt.
    Vestibulum ullamcorper lorem non sapien suscipit, non congue tellus lobortis. Nulla quis ante vel risus aliquam scelerisque. Sed felis augue, luctus at elementum non, sagittis malesuada urna. Suspendisse congue hendrerit purus vitae dapibus. Vivamus
    sit amet sodales arcu. Etiam euismod urna eleifend lacus varius, eu dapibus justo feugiat. Donec suscipit vel erat at ullamcorper. Morbi ac accumsan ipsum, at bibendum nisi. In placerat feugiat orci tincidunt scelerisque. Maecenas justo metus, tincidunt
    et turpis a, sodales adipiscing tortor.
  </p>
  <p >
    Cras non ipsum sapien. Nunc lobortis, mi et iaculis ultricies, eros tellus tempor orci, vel lobortis eros leo nec nunc. Maecenas nec mi sed elit luctus volutpat in a libero. Nulla tellus est, posuere in magna a, fringilla porttitor augue. Ut rhoncus laoreet
    sapien in fermentum. Phasellus id velit eu ligula tristique ullamcorper. Curabitur vitae pulvinar dolor, vitae mollis ipsum. Pellentesque faucibus mi nec imperdiet pellentesque. Mauris est sapien, consequat id ipsum non, vulputate ullamcorper tortor.
    Phasellus sollicitudin diam ac eleifend posuere. Proin vulputate risus non nisi molestie aliquet. Sed ligula libero, scelerisque sed gravida quis, adipiscing non erat. Nunc pretium facilisis neque ut faucibus. Vestibulum interdum hendrerit justo,
    eu sodales leo pretium ac. Nunc malesuada fermentum nisl, ut elementum elit tincidunt eget. Suspendisse auctor convallis nibh nec volutpat.
  </p>
  
</section>
!

CSS 

              
                #activar {
  display: none;
}

#activar ~ .desplegable {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  max-height: 30px;
  overflow: hidden;
  text-align: center;
  transition: max-height 0.8s linear;
  z-index: 1;
}

#activar ~ .desplegable .contenido {
  width: 100%;
  max-height: 0;
  overflow: hidden;
  padding: 0 20px;
  border: 0;
  box-sizing: border-box;
  color: #fff;
  background: #000;
}

.label {
  position: relative;
  width: 200px;
  margin: 0 auto;
  padding: 5px 20px;
  line-height: 30px;
  font-size: 14px;
  box-sizing: border-box;
  color: orange;
  background: #000;
  border-radius: 0 0 20px 20px;
  text-align: center;
  font-family: Oswald;
  cursor: pointer;
}
#activar ~ .desplegable .label:before {
  content: "FOLLOW";
}

#activar:checked ~ .desplegable,
#activar:checked ~ .desplegable .contenido {
  max-height: 100%;
}

#activar:checked ~ .desplegable .contenido {
  padding: 30px 20px;
}

#activar:checked ~ .desplegable .label:before {
  content: "CERRAR";
}

/* Sólo formato para contenido */

body,
html {
  margin: 0;
  padding: 0;
  background: #ccc;
  text-align: center;
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 20px;
}

.cabecera {
  width: 100%;
  height: 0;
  padding-bottom: 35%;
  overflow: hidden;
  position: relative;
}

header img {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: auto;
  margin: auto;
  padding: 0;
}

section {
  padding: 20px 40px;
  text-align: left;
}

section img {
  width: 100%;
  height: auto;
  margin: 0 0 10px 0;
}
h1 {
  display: block;
  margin: 10px auto 0;
  padding: 10px;
  text-align: center;
  font-size: 30px;
  line-height: 32px;
  letter-spacing: -2px;
  font-weight: bold;
  box-sizing: border-box;
}

ul.iconmenu {
  margin: 0 auto;
  padding: 0;
  text-align: center;
  font-size: 0;
}

ul.iconmenu li {
  position: relative;
  display: inline-block;
  overflow: hidden;
}

ul.iconmenu li a {
  text-decoration: none;
  color: orange;
  padding: 0 10px;
  font-family: Oswald, sans-serif;
  font-size: 26px;
  line-height: 26px;
  box-sizing: border-box;
}

ul.iconmenu li a.falink {
  color: #007BB6;
}

ul.iconmenu li a.faface {
  color: #3C599F;
}

ul.iconmenu li a.fagoog {
  color: #DA2713;
}

ul.iconmenu li a.fatwit {
  color: #5DD7FC;
}

ul.iconmenu li a:hover {
  color: orange;
}
!

JS 

              
                
$('img').smoove({
    offset : '40%'
  });
!
999px

Console