Pen Settings



CSS Base

Vendor Prefixing

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.

+ add another resource


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.

+ add another resource


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.


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.




                @keyframes show {
    0% {opacity: 0;}
    20% {opacity: 1;}
    80% {opacity: 1;}
    100% {opacity: 0;}

li {
  display: none;

li.animate {
    animation: show 3s linear;
    display: inline-block;


                var slideIndex = 0;
// Here you select all the HTML elements you want to use as slides
// querySelectorAll is a good choice 
//as it allows you to select elements using CSS selectors, I kinda love it!
var all = document.querySelectorAll("li");

// Ok, let's start calling the function, so that it starts right away

// This function simply adds a CSS class and removes it as the timeout ends, 
// be careful, it should be the same as the CSS animation you're going to build, 
// or else it won't allow to show the full animation.
function carousel() {
  var i;
  // Let's remove the class to each element first
  for (i = 0; i < all.length; i++) {
  // Then increment the slide idex (which element you want to animate)
  // Of course you have to go to the first element if you reach the end.
  if (slideIndex > all.length) {slideIndex = 1}
  // Add the class to the current index element.
  setTimeout(carousel, 3000);