Example of box-sizing:border-box;

A Pen By Todd Carter

Pen Settings

↑ Insert the most common viewport meta tag

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource
via CSS Lint

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource
via JS Hint

Code Indentation


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If active, the preview will update automatically when you change code.


              <div class="container">
  <div class="foo">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut sit amet vestibulum lacus. Maecenas convallis, libero sed consectetur aliquam, lectus odio auctor ipsum, id semper dui enim sit amet urna. Nulla ac sapien felis. Nullam sapien erat, rutrum ac viverra et, commodo a diam. Donec tellus lectus, ullamcorper vel fermentum sed, tempus ut metus. Nunc semper nulla non nulla sagittis in tristique arcu luctus. Quisque sapien enim, dapibus non imperdiet sed, convallis sollicitudin justo.


              @import "compass/css3";

.container {
  .foo {
    width:55.5556%; /* 500/900 = 0.555555555555555556 */


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