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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.

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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.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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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 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.

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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.

If the stylesheet 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 CSS 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.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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.

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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.

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HTML 

              
                <p>By winning <a href="https://blog.codepen.io/rodeo/season-two/#week-three">week three of seasons 2</a> of the CodePen rodeo, I've won one year of PRO membership. As I already am a PRO member I don't have much need for this. But the guys at CodePen were kind enough to let me give it to another user. So I figured I'd do a little challenge of my own for you to take part in.</p>
<p>The objective is to create a nice looking colour palette that could be part of a styleguide, something like in <a href="http://dribbble.com/shots/1114017-Color-Palette" title="'Color Palette' by Bill S Kenney">this awesome Dribbble shot</a>.</p>
<ul class="palette">
  <li class="swatch" title="#4cadeb"></li>
  <li class="swatch" title="#7ac2f0"></li>
  <li class="swatch" title="#a8d7f5"></li>
  <li class="swatch" title="#eb8a4c"></li>
  <li class="swatch" title="#f0a87a"></li>
  <li class="swatch" title="#f5c6a8"></li>
  <li class="swatch" title="#9b9b9b"></li>
  <li class="swatch" title="#b5b5b5"></li>
</ul>
<p>Make it pretty, make it playful, make it awesome. You can use whatever you want; CSS, JS, jQuery, use what fits you best.</p>
<p>There are some requirements as to what must be included:</p>
<ul class="requirements">
  <li class="requirement">The colours #4cadeb, #7ac2f0, #a8d7f5, #eb8a4c, #f0a87a, #f5c6a8, #9b9b9b, #b5b5b5 (shown above) must be included.</li>
  <li class="requirement">For each colour, the respective RGB, HSL and HEX value must be visible.</li>
</ul>
<p>Responsive behaviour and fancy animations are entirely optional, but they might give you a little bonus.</p>
<p>Be sure to tag your entry with <b><a href="https://codepen.io/tag/pro-007">pro-007</a></b>. I will pick the winner myself, so it doesn't really matter how many views or hearts you get. You may only have <b>one entry</b> at a time. The challenge <b>ends June 28, 2013</b>.</p>
<p>If you have any questions you can contact me <a href="https://twitter.com/sachaschmid">on Twitter</a>. Good luck to all of you!</p>
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CSS 

              
                @import "compass/css3";

@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:400,700);

@mixin keyframes ($name) {
  @-webkit-keyframes $name { @content; }
  @-moz-keyframes $name { @content; }
  @-ms-keyframes $name { @content; }
  @keyframes $name { @content; }
}

@mixin animation ($value) {
  -webkit-animation: $value;
  -moz-animation: $value;
  -ms-animation: $value;
  animation: $value;
}

@mixin animation-delay ($value) {
  -webkit-animation-delay: $value;
  -moz-animation-delay: $value;
  -ms-animation-delay: $value;
  animation-delay: $value;
}

* {
  @include box-sizing(border-box);
}

%clearfix::after {
  content: "";
  display: table;
  clear: both;
}

body {
  max-width: 40em;
  padding: 0 3em;
  margin: 3em auto;
  font: 100%/1.5 Roboto Condensed, sans-serif;
  color: #333;
  background-color: #fafafa;
}

p,
ul {
  margin-top: 0;
  margin-bottom: 1.5em;
}

a {
  @include transition(color 0.25s ease-in-out, border-bottom-color 0.25s ease-in-out);
  color: #4cadeb;
  border-bottom: 1px solid transparent;
  text-decoration: none;
  
  &:hover,
  &:focus {
    color: lighten(#4cadeb, 10%);
    border-bottom-color: lighten(#4cadeb, 10%);
  }
}

.palette {
  @extend %clearfix;
  padding: 1.5em;
  margin: 0 -1.5em 1.5em;
  list-style: none;
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 3px;
}

.swatch {
  @include transition(transform 0.25s ease-in-out);
  @include animation(popup 0.5s ease-in-out);
  float: left;
  width: 11.625%;
  padding-bottom: 11.625%;
  margin-right: 1%;
  border-radius: 50%;
  -webkit-backface-visibility: hidden;
  
  &:last-child {
    margin-right: 0;
  }
    
  &:hover {
    @include transform(translateY(-10%));
  }
}

.swatch:nth-child(1) {
  background-color: #4cadeb;
}

.swatch:nth-child(2) {
  @include animation-delay(0.1s);
  background-color: lighten(#4cadeb, 10%);
}

.swatch:nth-child(3) {
  @include animation-delay(0.2s);
  background-color: lighten(#4cadeb, 20%);
}

.swatch:nth-child(4) {
  @include animation-delay(0.3s);
  background-color: adjust_hue(#4cadeb, -180deg);
}

.swatch:nth-child(5) {
  @include animation-delay(0.4s);
  background-color: lighten(adjust_hue(#4cadeb, -180deg), 10%);
}

.swatch:nth-child(6) {
  @include animation-delay(0.5s);
  background-color: lighten(adjust_hue(#4cadeb, -180deg), 20%);
}

.swatch:nth-child(7) {
  @include animation-delay(0.6s);
  background-color: desaturate(#4cadeb, 80%);
}

.swatch:nth-child(8) {
  @include animation-delay(0.7s);
  background-color: lighten(desaturate(#4cadeb, 80%), 10%);
}

.requirements {
  padding: 0;
  list-style: none;
}

.requirement {
  @include background-image(linear-gradient(#fff, #fafafa));
  @include transition(border 0.25s ease-in-out);
  padding: 1em;
  margin-bottom: 0.75em;
  border: 1px solid #e8e8e8;
  border-left-width: 5px;
  border-radius: 3px;
  
  &:hover {
    border-left-width: 10px;
  }
}

@include keyframes(popup) {
  50% { @include transform(translateY(-10%)); }
  100% { @include transform(translateY(0)); }
}
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JS
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999px

Console