The only CSS you will ever need
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Latest commit 4ccf11e Aug 11, 2017 @jpetitcolas jpetitcolas Merge pull request #40 from marmelab/fix_lone ❀️
Fix typo in border style type πŸ™‰


The only CSS you will ever need.


  • Self-documented classnames
  • Zero dependencies
  • Classnames are reusable across projects
  • Removes the need for a CSS preprocessor
  • Removes the need for a CSS bundler
  • No more custom CSS required
  • No need to switch between HTML and CSS file while developing
  • HTTPS ready
  • No more debate about rule naming (dash, double dash or underscore?). The CSS spec is all we need!


Insert this one line in your HTML source file:

<link rel="stylesheet" src="" />

Then you can change the CSS classes in your HTML to universal CSS classes:


<!-- index.html -->
<div class="sidebar">
    <!-- sidebar content -->
/* main.css */
.sidebar {
    border-top: 1.04em dotted lightgrey;
    border-bottom: 12px solid cornflowerblue;
    border-top-right-radius: 1.60em;
    padding: 5px;
    margin-left: 10px;
    background-color: fuchsia;


<!-- index.html -->
<div class="
    <!-- sidebar content -->
/* main.css */
/* Nothing! */

Check out our demo


Where is the documentation?

You don't need documentation. Take any CSS rule you want to apply, replace : by -, and dots by -dot-, and you get the name of the corresponding universal css classname. For instance,

border-top-right-radius: 1.60em => .border-top-right-radius-1-dot-60em

How can you know which classes I need?

We use a smart CSS generator, based on statistical analysis of most used CSS rules, and coupled with a sophisticated prediction engine. Check out the source code for details.

Do you provide a minified version?

universal.css is already highly optimized, and wouldn't benefit much from minification. Check this extract of the source code for a glimpse of the universal.css file syntax.

.color-black { color: black; }
.background-color-black { background-color: black; }
.border-color-black { border-color: black; }
.color-blanchedalmond { color: blanchedalmond; }
.background-color-blanchedalmond { background-color: blanchedalmond; }
.border-color-blanchedalmond { border-color: blanchedalmond; }

But universal.css weights several MBs. How can I optimize the rendering time?

You're covered! If you don't want your users to download a large CSS file, replace the <link> tag with a <script> tag:

<script src=""></script>

That's right! Our generator works both in the backend and in the frontend - it is truly universal. The JavaScript file is much lighter, and will load very quickly. Once loaded, it generates the universal.css styles directly in the browser.

I need a class for Webdings Fonts.

Universal.css is a community effort, currently at an early stage. We don't yet cover all CSS rules, but we welcome every Pull Request helping us to achieve feature completeness.

How can I deal with responsive designs and break points?

We're studying the question, please open an issue if you have a good idea about how to do it.

Where did you get the inspiration from?

Bootstrap V4 recently introduced spacing utility classes like m-t-1 (which translates to margin-top: 1rem!important), and we thought we'd expand this idea to more classes.

Is this a joke?

Of course it's a joke. Use semantic CSS class names.


Universal.css is provided free of charge, courtesy of marmelab, under the WTFPL License.