Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ 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.


Save Automatically?

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.


                <p class="ellipsis-container clamped clamped-2">
    <span class="ellipsis">
        There's a bit of text here. Enough to trigger the effect? Probably not.
<p class="ellipsis-container clamped clamped-3">
    <span class="ellipsis">
        But more text here (the same markup structure though): if the text overflows from the clamped paragraph's height, the ellipse will show. You may have to resize the browser window (or this paragraph's container) to see the effect in action.


                /* The ellipsis classes reveal a '...' if there is more content that isn't being displayed */

/* The ellipsis-container class adds padding to the container to stop the ellipsis clipping text */
.ellipsis-container {
  padding-right: 1em;
  position: relative;

.ellipsis {
  background: inherit;
  display: inline;

.ellipsis:after {
  background: inherit;
  position: absolute;

.ellipsis:before {
  content: '\2026';
  bottom: 0;
  right: 0;

.ellipsis:after {
  content: '';
  height: 100%;
  width: 100%;

/* Clamping is just a mechanism to limit the number of lines that can be displayed in a container */
.clamped {
  line-height: 1.5;
  overflow: hidden;

.clamped-2 {
  /* Clamp to 2 lines, ie line-height x 2: */
  max-height: 3em;

.clamped-3 {
  max-height: 4.5em;

/* Generic styles */
body {
  background: #cfdbec;
  color: #cfdbec;
  font: 12px/1.5 Consolas, monospace;
  margin: 0;

p {
  /* This background image causes zebra striping. It happens to be 36px high, ie twice the line height ( 12px * 1.5 * 2 ). Background-sizing may be necessary. */
  background-image: url(data:image/gif;base64,R0lGODlhAQAkAIAAAERERC8vLyH5BAAAAAAALAAAAAABACQAAAIHhI95we3fCgA7);
  /* This part is essential to keep the ellipsis bits in sync */
  background-attachment: fixed;
  border: 1.5em solid #2f2f2f;
  /* Keeping a tight vertical rythm (everything in multiples of 1.5em) makes sure the background image will always align */
  margin: 1.5em 0;