Pen Settings

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.

Learn more · Versions

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.

Learn more · Versions

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).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

Powered by Algolia
About External Resources

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.

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

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

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

Learn more · Versions

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

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.

Learn more

+ add another resource

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.

Powered by Algolia
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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <html>
  <head>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Dancing+Script">
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto">
  </head>
    
  <body>
    
    <div class="container">
    <header>
      <div class="menu-toggle" data-js="menu-toggle">
        <span class="menu-toggle-grippy">Toggle</span>
        <span class="menu-toggle-label">Menu</span>
      </div>
    </header>
      
    <section class="banner" role="banner">
      <h1>Hello there</h1>
      <h2>This is an experimental CodePen which utilises an absolutely positioned hidden panel which can be triggered by clicking a toggle.</h2>
    </section>
    
    <div class="hidden-panel">
      
      <span class="hidden-panel-close" data-js="hidden-panel-close">Close</span>
      
      <div class="hidden-panel-content">
        
        <nav class="hidden-panel-nav">
          <h3>Quick Look</h3>
          <ul>
            <li><a href="#" title="Home">Home</a></li>
            <li><a href="#" title="About">About</a></li>
            <li><a href="#" title="Blog">Blog</a></li>
            <li><a href="#" title="Work">Work</a></li>
            <li><a href="#" title="Contact">Contact</a></li>
          </ul>
        </nav>
        
        <div class="hidden-panel-text">
          <p>This is an experimental CodePen which utilises an absolutely positioned hidden panel which can be triggered by clicking a toggle.</p>
        </div>
        
        <div class="hidden-panel-credits">
          <span>Coded by <a href="https://twitter.com/darrenhuskie" title="Darren Huskie">Darren Huskie</a>.</span>
          <span>Powered by <a href="#" title="some framework">some framework</a>.</span>
          <span>Hosted by a <a href="#" title="web host">web host</a>.</span>
        </div>
        
      </div>
    </div>
    </div>

  </body>
</html>
!

CSS 

              
                body
  color: #878787
  font-family: Roboto, sans-serif
  left: 0
  line-height: 1.35
  margin: 0
  overflow: hidden
  position: relative
  text-rendering: optimizeLegibility
  -webkit-font-smoothing: antialiased
  transition: left 0.3s ease-in-out
  &.panel-open
    left: -250px

.container
  @extend %cf
  min-height: 1000px

a
  outline: 0
  text-decoration: none 

h1, h2, h3, h4, h5, h6
  margin: 0
  padding: 0

header
  @extend %cf
  color: #fff
  padding: 3em 5%
  position: relative
  width: 90%
  z-index: 2

.menu-toggle
  @extend %cf
  cursor: pointer
  float: right
  font-size: 0.875rem
  transition: all 0.3s ease-in-out
  &.open
    opacity: 0.5

.menu-toggle-grippy
  border-bottom: 5px solid #fff
  border-top: 5px solid #fff
  float: left
  line-height: 0
  margin-right: 1em
  padding: 5px 0
  text-indent: -999em
  width: 35px
  &:after
    background: #fff
    content: ''
    display: block
    height: 5px

.menu-toggle-label
  float: left
  font-weight: 700
  height: 25px
  letter-spacing: 1px
  line-height: 25px
  text-transform: uppercase

.hidden-panel
  background: #333
  color: #666
  font-size: 0.875rem
  height: 100%
  position: absolute
  right: -250px
  top: 0
  width: 250px
  a
    color: #999
    transition: color 0.3s ease-out
    &:hover
      color: #fff

.hidden-panel-close
  color: #666
  cursor: pointer
  position: absolute
  right: 20px
  top: 3.7em
  transition: color 0.3s ease-in-out
  &:hover
    color: #fff

.hidden-panel-content
  padding: 3.65em 10%

.hidden-panel-nav
  border-bottom: 1px solid #666
  border-bottom: 1px solid rgba(#666, 0.25)
  margin-bottom: 1.5em
  padding-bottom: 1.5em
  text-transform: uppercase
  h3
    letter-spacing: 1px
    margin-bottom: 1em
  ul
    list-style: none
    font-weight: 600
    margin: 0
    padding: 0
  li
    padding: 0.25em 0

.hidden-panel-text
  line-height: 1.5
  p
    margin-bottom: 1.5em
    &:last-child
      margin-bottom: 0

.hidden-panel-credits
  font-size: 12px
  font-size: 0.75rem
  line-height: 1.5
  span
    display: block
    margin-bottom: 0.15em

.banner
  background: #f5756c
  background: linear-gradient(#f5756c,#fd5480),#f5756c
  box-sizing: border-box
  height: 100%
  left: 0
  padding: 5em 0
  position: absolute
  text-align: center
  top: 0
  width: 100%
  z-index: 1
  h1
    color: #fff
    font-family: 'Dancing Script'
    font-size: 4.375rem
    margin-bottom: 1em
  h2
    color: #fff
    font-size: 2rem
    font-weight: 300
    line-height: 1.5
    margin: 0 auto
    width: 50%

%cf:before, %cf:after
  content: ''
  display: table

%cf:after
  clear: both
!

JS 

              
                var menuToggle = document.querySelector('[data-js="menu-toggle"]');

// Remove this setInterval to trigger the open/close manually through the UI
var interval = setInterval(function() {
  menuToggle.click();
}, 2000);

// Clear the interval on any click
document.body.addEventListener('click', function () {
   clearInterval(interval);
});

menuToggle.addEventListener('click', function () {
  document.body.classList.toggle('panel-open');
  menuToggle.classList.toggle('open');
});

var closePanel = document.querySelector('[data-js="hidden-panel-close"]');

closePanel.addEventListener('click', function () {
  document.body.classList.remove('panel-open');
  menuToggle.classList.remove('open');
});
!
999px

Console