Pen Settings

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.

Learn more · Versions

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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

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

Learn more · Versions

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 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.

Powered by Algolia
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.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

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.

Powered by Algolia
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.

Learn more

+ add another resource

Packages

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.

Powered by Algolia
About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

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.

HTML 

              
                <div id="app">
  <div>
    <div class="birthday-cake">
      <div class="candle">
        <div class="fire">
          <div class="inner-fire"></div>
        </div>
      </div>
      <div class="extra"></div>
      <div class="cake">
        <div class="top"></div>
      </div>
      <div class="base">
        <div class="base-1"></div>
        <div class="base-2"></div>
        <div class="base-3"></div>
      </div>
    </div>
    <p>
      <a href="https://twitter.com/baumannzone">Baumannzone</a> ·
      <a href="https://github.com/baumannzone/pure-css-cake">GitHub</a>
    </p>
  </div>
</div>
!

CSS 

              
                base-color = #607d8b
base-border-color = darken(base-color, 15%)
cake-color = #f5f1dd
cake-lines-color = #cba15f
chocolate-color = #6b46c1
candle-color = #9e9e9e
fire-color = yellow
inner-fire-color = orange

body
  background-color #a8ecc1
#app
  display flex
  justify-content center
  font-family Avenir, Helvetica, Arial, sans-serif
  -webkit-font-smoothing antialiased
  -moz-osx-font-smoothing grayscale
  margin-top 50px

p
  margin-top 100px
  text-align center
  a
    color chocolate-color
.birthday-cake
  margin-top 50px
  transform scale(.7)
  @media (min-width: 465px) {
    transform scale(1)
  }
  .candle
    position relative
    width 20px
    height 80px
    background-color candle-color
    margin 0 auto
    &:after
      content ''
      position absolute
      top -12px
      left calc(50% - 2px)
      width 4px
      height 12px
      background-color #555
      opacity .8
    .fire
      position absolute
      opacity .7
      background fire-color
      width 40px
      height 40px
      margin-top -45px
      transform rotate(45deg)
      left calc(50% - 20px)
      border-top-right-radius 30px
      border-bottom-left-radius 30px
      border-bottom-right-radius 30px
      animation flaming 3s ease-in-out infinite;
    .inner-fire
      position relative
      opacity .5
      background inner-fire-color
      width 20px
      height 20px
      top 14px
      left 14px
      border-top-right-radius 30px
      border-bottom-left-radius 30px
      border-bottom-right-radius 30px
      animation flaming-inner 2s ease-out infinite;
  .extra
    margin 0 auto
    background-color chocolate-color
    width 220px
    height 50px
    border-top-left-radius 30px
    border-top-right-radius 30px
  .cake
    position relative
    width 400px
    height 180px
    margin 0 auto
    border-top-left-radius 40px
    border-top-right-radius 40px
    background-color cake-color
    &:after,
    &:before
      content ''
      position absolute
      width 400px
      height 20px
      background-color cake-lines-color
      bottom 0
    &:after
      margin-bottom 30px
    &:before
      margin-bottom 70px
    .top
      position relative
      width 400px
      height 50px
      border-top-left-radius 40px
      border-top-right-radius 40px
      background-color chocolate-color
      &:before
        content ''
        position absolute
        width 25px
        height 45px
        top 40px
        border-bottom-left-radius 40px
        border-bottom-right-radius 40px
        background-color chocolate-color
        box-shadow 50px -12px chocolate-color,
        100px -7px chocolate-color,
        150px 0 chocolate-color,
        200px 10px chocolate-color,
        250px -1px chocolate-color,
        300px -10px chocolate-color,
        350px 0px chocolate-color
      &:after
        content ''
        position absolute
        width 25px
        height 45px
        top 38px
        left 25px
        border-top-left-radius 50px
        border-top-right-radius 50px
        background-color cake-color
        box-shadow 50px -15px cake-color,
        100px -10px cake-color,
        150px -7px cake-color,
        200px -2px cake-color,
        250px -5px cake-color,
        300px -10px cake-color,
        350px 0px cake-color
  .base
    .base-1
      width 450px
      height 30px
      background-color base-color
      border-top 5px solid base-border-color
      border-bottom-left-radius 30px
      border-bottom-right-radius 30px
    .base-2
      width 100px
      height 50px
      margin 0 auto
      border-top 10px solid base-border-color
      background-color base-color
    .base-3
      width 200px
      height 30px
      margin 0 auto
      border-top-left-radius 10px
      border-top-right-radius 10px
      background-color base-color
  @keyframes flaming {
    50% {
        transform: scaleY(.9) rotate(45deg) translate(3px, 3px)
      }
    }
  @keyframes flaming-inner {
    50% {
      transform: scale(1.1) translate(-1px, -1px)
    }
  }
!

JS
!
999px

Console