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 

              
                .trick-or-treat
  input(type='checkbox')
  .trick-or-treat__backdrop
    .eyes
    .eyes
    .eyes
    .spot
    .spot
    .spot
  .trick-or-treat__toggle.toggle
    .toggle__body
      .toggle__eye.toggle__eye--left
      .toggle__eye.toggle__eye--right
      .toggle__nose
      .toggle__mouth
      .toggle__wrapper.toggle__wrapper--right
      .toggle__wrapper.toggle__wrapper--left
      .toggle__wrapper-shine
!

CSS 

              
                *
  box-sizing border-box

body
  background #111
  display flex
  min-height 100vh
  align-items center
  justify-content center

$transition = .35s
$sweet-main = #f62459
$sweet-secondary = lighten($sweet-main, 25%)
$skull = #f0e2c8
$checked-bg = dodgerblue
$unchecked-bg = darken(#4d13d1, 25%)

.trick-or-treat
  border-radius 100px
  overflow hidden
  height 100px
  position relative
  width 200px
  border 6px solid #eeeeee

  @media(min-width 768px)
    border 10px solid #eeeeee
    height 200px
    width 400px

  input
    cursor pointer
    height 100%
    width 100%
    opacity 0
    left 0
    top 0
    position absolute
    z-index 2

    &:checked
      ~ .trick-or-treat__toggle
        transform translate(100%, 0)

        .toggle__body
          $clip = polygon(-100% -100%, -100% -100%, -100% 200%, -100% 200%, -100% 200%, 200% 200%, 200% 200%, 200% 200%, 200% -100%, 200% -100%)
          clip-path $clip
          -webkit-clip-path $clip
          transform translate(-50%, -50%) rotate(585deg) scale(0.5, 0.4)
          background $sweet-main
          // horizontal / vertical radius
          border-radius 50% / 45%
          transition transform $transition, -webkit-clip-path $transition, clip-path $transition , background $transition, border-radius $transition

        .toggle__eye
        .toggle__eye:after
        .toggle__nose
        .toggle__mouth
        .toggle__mouth:after
        .toggle__mouth:before
          background $sweet-main

        .toggle__wrapper-shine
          opacity 1

      ~ .trick-or-treat__backdrop
        background $checked-bg

        .eyes:after
        .eyes:before
          background $checked-bg

        .spot
          animation-name scale
          background white


  &__backdrop
    background $unchecked-bg
    height 100%
    position absolute
    width 100%
    transition background $transition

  &__toggle
    height 100%
    left 0
    position absolute
    width 50%
    transition transform $transition

.toggle

  /* body is used for both the trick and treat main body */
  &__body
    position absolute
    height 75%
    width 75%
    background $skull
    border-radius 100%
    top 50%
    left 50%
    transition border-radius $transition, background $transition, -webkit-clip-path $transition, clip-path $transition, transform $transition
    transform translate(-50%, -50%) rotate(0deg) scale(1, 1)
    $clip = polygon(0 0, 0 60%, 12.5% 70%, 25% 70%, 25% 100%, 75% 100%, 75% 70%, 87.5% 70%, 100% 60%, 100% 0)
    -webkit-clip-path $clip
    clip-path $clip

  /* Skull eye */
  &__eye
    height 20%
    width 20%
    background black
    position absolute
    border-radius 50%
    top 40%
    left 50%
    transition background $transition

    &:after
      content ''
      position absolute
      height 5px
      width 5px
      background orange
      border-radius 100%
      transform translate(-50%, -50%)
      transition background $transition

      @media(min-width 768px)
        height 10px
        width 10px


    &--left
      height 40%
      width 30%
      transform translate(-50%, -50%) translate(-65%, 0)

      &:after
        bottom 15%
        left 65%

    &--right
      height 30%
      width 25%
      transform translate(-50%, -50%) translate(60%, 0)

      &:after
        bottom 10%
        left 45%

  /* skeleton nose */
  &__nose
    height 10%
    width 10%
    background black
    position absolute
    top 60%
    left 50%
    transform translate(-50%, -50%)
    transition background $transition
    $clip = polygon(0 100%, 50% 0, 100% 100%)
    clip-path $clip
    -webkit-clip-path $clip

  /* skeleton mouth*/
  &__mouth
    width 35%
    background black
    height 5%
    border-radius 4px
    position absolute
    bottom 15%
    left 50%
    transform translate(-50%, -50%)
    transition background $transition

    &:after
    &:before
      content ''
      position absolute
      width 35%
      height 100%
      border-radius 4px
      background black
      top 50%
      transform translate(-50%, -50%) rotate(90deg)
      transition background $transition

    &:after
      left 30%

    &:before
      left 70%

  &__wrapper
    position absolute
    top 50%
    background $skull
    width 50%
    height 120%
    transform translate(0, -50%)
    $clip = polygon(0 45%, 100% 0, 55% 35%, 100% 50%, 55% 65%, 100% 100%, 0 55%)
    -webkit-clip-path $clip
    clip-path $clip

    &--right
      left 100%

    &--left
      right 100%
      transform translate(0, -50%) rotate(180deg)

  &__wrapper-shine
    height 100%
    width 100%
    position absolute
    opacity 0
    border-radius 50% / 45%
    overflow hidden
    transition opacity $transition

    &:after
    &:before
      border-radius 50% / 50%
      content ''
      position absolute
      height 100%
      width 100%
      bottom 6%
      right 2%

    &:before
      background white

    &:after
      background $sweet-main
      bottom 10%
      right 2%
      height 110%
      width 110%


.eyes
  height 6px
  width 6px
  position absolute
  top 50%
  left 50%
  transform translate(-50%, -50%) scaleY(1)
  transform-origin center
  animation blink 4s infinite linear

  @media(min-width 768px)
    height 10px
    width 10px

  &:nth-of-type(1)
    top 15%
    left 65%
    opacity .1
    animation-delay 1s

  &:nth-of-type(2)
    top 80%
    left 60%
    opacity .4
    animation-delay 3s

  &:nth-of-type(3)
    top 60%
    left 85%
    opacity .25
    animation-delay 2s

  &:after
  &:before
    content ''
    background $skull
    border-radius 100% 0
    position absolute
    height 100%
    width 100%
    opacity .8
    top 50%
    left 50%
    transition background $transition

  &:after
    transform translate(-50%, -50%) translate(90%, 0) rotate(45deg)

  &:before
    transform translate(-50%, -50%) translate(-90%, 0) rotate(45deg)

.spot
  height 50px
  width 50px
  position absolute
  top 50%
  left 50%
  transform translate(-50%, -50%) scale(0)
  transform-origin center
  background $unchecked-bg
  border-radius 100%
  animation-duration 4s
  animation-iteration-count infinite
  animation-timing-function linear
  animation-fill-mode both
  transition background .5s

  &:nth-of-type(4)
    top 15%
    left 35%
    opacity .1
    animation-delay 1s

  &:nth-of-type(5)
    top 80%
    left 40%
    opacity .4
    animation-delay 3s

  &:nth-of-type(6)
    top 60%
    left 15%
    opacity .25
    animation-delay 2s

@keyframes blink
  9%
    transform translate(-50%, -50%) scaleY(1)
  10%
    transform translate(-50%, -50%) scaleY(0)
  11%
    transform translate(-50%, -50%) scaleY(1)
  12%
    transform translate(-50%, -50%) scaleY(0)
  13%
    transform translate(-50%, -50%) scaleY(1)

@keyframes scale
  from
    opacity 1
    transform translate(-50%, -50%) scale(0)
  to
    opacity 0
    transform translate(-50%, -50%) scale(1)
!

JS 

              
                // ???
!
999px

Console