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HTML

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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

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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).

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JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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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.

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HTML 

              
                %h1 Lollipop Transition
.wrap
  .content
    %h2 Well Hello!
    %p Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.
  
    %p Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.
  
%a.button.glyphicon.glyphicon-plus{:href => "#"}
!

CSS 

              
                $button: #007fed
$background: #e6e6e6
  
body
  background: $background
  width: 100%
  height: 100vh
  position: relative
h1
  color: darken($background, 12%)
  font-weight: 200
  text-align: center
  position: absolute
  top: 45%
  width: 100%
h2
  color: $button
  font-weight: bold
  border-bottom: 1px solid #eee
  padding-bottom: 15px
  margin-bottom: 15px
p
  color: #001818
.wrap
  position: absolute
  overflow: hidden
  top: 10%
  right: 10%
  bottom: 85px
  left: 10%
  padding: 20px 50px
  display: block
  border-radius: 4px
  transform: translateY(20px)
  transition: all 0.5s
  visibility: hidden
  
  .content
    opacity: 0
  
  &:before
    position: absolute
    width: 1px
    height: 1px
    background: white
    content: ''
    bottom: 10px
    left: 50%
    top: 95%
    color: #fff
    border-radius: 50%
    -webkit-transition: all 600ms cubic-bezier(0.215, 0.61, 0.355, 1)
    transition: all 600ms cubic-bezier(0.215, 0.61, 0.355, 1)
  
  &.active
    display: block
    visibility: visible
    box-shadow: 2px 3px 16px darken($background, 15%) 
    transition: all 600ms
    transform: translateY(0px)
    transition: all 0.5s
      
    &:before
      height: 2000px
      width: 2000px
      border-radius: 50%
      top: 50%
      left: 50%
      margin-left: -1000px
      margin-top: -1000px
      display: block
      -webkit-transition: all 600ms cubic-bezier(0.215, 0.61, 0.355, 1)
      transition: all 600ms cubic-bezier(0.215, 0.61, 0.355, 1)
  
    .content
      position: relative
      z-index: 1
      opacity: 1
      transition: all 600ms cubic-bezier(0.55, 0.055, 0.675, 0.19)
     

a.button
  padding: 11px 11px 13px 13px
  outline: none
  border-radius: 50%
  background: $button
  color: #fff
  font-size: 24px
  display: block
  position: fixed
  left: 50%
  bottom: 20px
  top: auto
  margin-left: -25px
  text-decoration: none
  transition: transform 0.25s

  &:hover
    text-decoration: none
    background: lighten($button, 10%)
  &.active
    transform: rotate(135deg)
    transition: transform 0.5s
!

JS 

              
                $('a').on('click', function(){
  $('.wrap, a').toggleClass('active');
  
  return false;
});
!
999px

Console