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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.

!
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.

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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 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.

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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.

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.

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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.

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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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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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM 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.

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HTML 

              
                link(href='https://fonts.googleapis.com/css?family=Oxygen:400,300,700' rel='stylesheet' type='text/css')
link(href='https://code.ionicframework.com/ionicons/1.4.1/css/ionicons.min.css' rel='stylesheet' type='text/css')

.signin.cf
  .avatar
  form
    .inputrow
      input(type="text", id="name", placeholder="Username")
      label.ion-person(for="name")
    .inputrow
      input(type="password", id="pass", placeholder="Password")
      label.ion-locked(for="pass")
    input(type="checkbox", name="remember", id="remember")
    label(for="remember", class="radio") Stay Logged In
    input(type="submit", value="Login")
!

CSS 

              
                vendor(prop, args)
  -webkit-{prop} args
  -moz-{prop} args
  {prop} args


font_color = #fff
ui_accent = #538a9a
gradient_start = #4e7a89
graident_end = #2e3441

html, body
  min-height: 100%
  font-family: Oxygen
  font-weight: 300
  font-size: 1em
  color: font_color

body
  background: graident_end
  background-image: -webkit-radial-gradient(top, circle cover, gradient_start, graident_end 80%)
  background-image: -moz-radial-gradient(top, circle cover, gradient_start, graident_end 80%)
  background-image: -o-radial-gradient(top, circle cover, gradient_start, graident_end 80%)
  background-image: radial-gradient(top, circle cover, gradient_start, graident_end 80%)
  -webkit-font-smoothing: antialiased
  -moz-osx-font-smoothing: grayscale

.signin
  avatar_size = 100px
  profile_padding = 20px
  display: block
  position: relative
  width: 250px
  margin: 20px auto
  padding: profile_padding
  background-color: rgba(0,0,0, 0.1)
  vendor(border-radius, 5px)
  shadows = inset 1px 1px 0 0 rgba(255,255,255, 0.2), inset -1px -1px 0 0 rgba(0,0,0, 0.2)
  vendor(box-shadow, shadows)

  .avatar
    width: avatar_size
    height: avatar_size
    margin: 0 auto 35px auto
    border: 5px solid #fff
    vendor(border-radius, 100%)
    vendor(pointer-events, none)

    &:before
      content: "\f272"
      text-align: center
      font-family: Ionicons
      display: block
      height: 100%
      line-height: avatar_size
      font-size: 5em

  .inputrow
    position: relative

    label
      position: absolute
      top: 12px
      left: 10px

      &:before
        color: ui_accent
        opacity: 0.4
        vendor(transition, opacity 300ms 0 ease)

  input[type="text"], input[type="password"]
    padding: 10px 12px 10px 32px
    display: block
    width: 100%
    margin-bottom: 10px
    border: 1px solid rgba(255,255,255, 0.5)
    background-color: rgba(255,255,255, 1)
    color: #333
    font-size: 1em
    font-weight: 300
    outline: none
    vendor(border-radius, 5px)
    vendor(transition, border-color 300ms 0 ease)
    vendor(box-sizing, border-box)

    &:focus + label:before
      opacity: 1

  input[type="submit"]
    -webkit-appearance: none
    height: 40px
    padding: 10px 12px
    margin-bottom: 10px
    background-color: ui_accent
    text-transform: uppercase
    color: #fff
    border: 0px
    float: right
    margin: 0
    outline: none
    vendor(border-radius, 5px)

    &:hover
      background-color: lighten(ui_accent, 5)

    &:active
      background-color darken(ui_accent, 5)


// Checkbox Styling
dot_container_width = 30px
dot_container_height = 16px
dot_height_difference = 4px
font_offset = 2px

input[type="checkbox"]
  display: none

  & + label
    position: relative
    padding-left: 36px
    font-size: 0.6em
    font-weight: normal
    line-height: dot_container_height
    opacity: 0.8
    text-transform: uppercase
    vendor(user-select, none)

    &:before, &:after
      content: ""
      position: absolute
      display: block
      height: dot_container_height
      vendor(border-radius, 30px)

    &:before
      left: 0
      top: 0 - font_offset
      width: dot_container_width
      background: rgba(0,0,0,0.3)
      vendor(box-shadow, inset 1px 1px 1px 1px rgba(0,0,0,0.3))

    &:after
      opacity: 0.3
      background: #fff
      top: (dot_height_difference / 2) - font_offset
      left: (dot_height_difference / 2)
      height: dot_container_height - dot_height_difference
      width: dot_container_height - dot_height_difference
      vendor(transition, all 200ms 0 ease)

input[type="checkbox"]:checked + label
  opacity: 1

  &:after
    opacity: 1
    left: dot_container_width - (dot_container_height - dot_height_difference) - (dot_height_difference / 2)

.cf:before, .cf:after
  content: " "
  display: table
.cf:after
  clear: both
.cf
  *zoom: 1
!

JS 

              
                # Nothing here!
!
999px

Console