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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

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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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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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 

              
                // Pen Title
.pen-title
  h1 
    <span>(Tutorial)</span>
    | Flat Login Form
  span
    | Pen <i class='fa fa-paint-brush'></i> + <i class='fa fa-code'></i> by <a href='http://andytran.me'>Andy Tran</a>
    
// Portfolio
a#portfolio(href='http://andytran.me/' title='View my portfolio!')
  i.fa.fa-link
  
// CodePen
a#codepen(href='https://codepen.io/andytran/' title='Follow me!')
  i.fa.fa-codepen

//- Input Mixin
mixin input(type, name, placeholder, label)
  .form-group
    input(type=type
          id=name
          placeholder=placeholder
          required)
    label(for=name)=label
    .line

//- Button Mixin
mixin button(label)
  button.button=label

//- Form Container Mixin
mixin form-container
  .form-container
    block
  
//- Form Mixin
mixin form(name, width, color, style)
  if style == '1'
    style(type='text/css').
      .style-1 .header h1 {
        color: #{color};
      }
      
      .style-1 .form-group input:valid,
      .style-1 .form-group input:focus {
        color: #{color};
      }
      
      .style-1 .form-group input:valid ~ .line,
      .style-1 .form-group input:focus ~ .line {
        background: #{color};
      }
      
      .style-1 .button {
        background: #{color};
      }
      
  if style == '2'
    style(type='text/css').
      .style-2 .header { 
        background: #{color};
      }
      
      .style-2 .form-group input:valid,
      .style-2 .form-group input:focus {
        color: #{color};
      }
      
      .style-2 .form-group input:valid ~ .line,
      .style-2 .form-group input:focus ~ .line {
        background: #{color};
      }
      
      .style-2 .button {
        background: #{color};
      }
      
  .form(class='style-#{style}'
        style='width: #{width};')
    header.header
      h1.active Sign In
      h1 Sign Up
    block
    footer.footer
      a(href='#') Forgot your password?
      
// Container
.container
  // Column
  .col
    // Form Container
    +form-container
      +form('Sign Up', '360px', '#33b5e5', '1')
        form.active
          +input('text', 'username', 'Username', 'Username')
          +input('password', 'password', 'Password', 'Password')
          +button('Login')
        form
          +input('text', 'username', 'Username', 'Username')
          +input('email', 'email', 'Email Address', 'Email Address')
          +input('password', 'password', 'Password', 'Password')
          +button('Login')
      p Not registered? 
        a.toggle(href='#') Sign up

  // Colum
  .col
    // Form Container
    +form-container
      +form('Sign Up', '360px', '#2c3e50', '2')
        form.active
          +input('text', 'username', 'Username', 'Username')
          +input('password', 'password', 'Password', 'Password')
          +button('Login')
        form
          +input('text', 'username', 'Username', 'Username')
          +input('email', 'email', 'Email Address', 'Email Address')
          +input('password', 'password', 'Password', 'Password')
          +button('Login')
      p Not registered? 
        a.toggle(href='#') Sign up
  
// Tip
#tip
  h1 How to create a form?
  p It's really simple... If you have basic knowledge of Jade. Simple fill out the paramaters in the mixin below, drop it below this box, and watch as magic happens!
  code
   h1 Jade
   p 
     | Please note that these are case sensitive. <br>
     | /* Mixin Guide<br>
     | * Form Container Mixin<br>
     | * +form-container<br>
     | *<br>
     | * Form Mixin<br>
     | * +form('name', 'width', 'color', 'style')<br>
     | *<br>
     | * Input Mixin<br>
     | * +input('type', 'name', 'placeholder', 'label')<br>
     | *<br>
     | * Button Mixin<br>
     | * +button('label')<br>
     | */<br><br>
   p <span>+form-container</span>
   p <span>+form</span><span>.active</span>(<span>'name'</span>, <span>'width'</span>, <span>'color'</span>, <span>'style'</span>)
   p <span>+input</span>(<span>'type'</span>, <span>'name'</span>, <span>'placeholder'</span>, <span>'label'</span>)
   p <span>+input</span>(<span>'type'</span>, <span>'name'</span>, <span>'placeholder'</span>, <span>'label'</span>)
   p <span>+button</span>(<span>'label'</span>)
   p <span>+form</span>(<span>'name'</span>, <span>'width'</span>, <span>'color'</span>, <span>'style'</span>)
   p <span>+input</span>(<span>'type'</span>, <span>'name'</span>, <span>'placeholder'</span>, <span>'label'</span>)
   p <span>+input</span>(<span>'type'</span>, <span>'name'</span>, <span>'placeholder'</span>, <span>'label'</span>)
   p <span>+button</span>(<span>'label'</span>)
   P <span>p</span> Not registered? 
   P <span>a</span><span>.toggle</span>(<span>href</span>='#') Sign up
  h1 Browser Support?
  p Tested on the latest versions of <b>Chrome</b>, <b>Firefox</b>, <b>Safari</b>, <b>Internet Explorer</b>, &amp; <b>Opera</b>.
  p Best viewed in Chrome because... I said so.
  
// Portfolio
a#portfolio(href='http://andytran.me/' title='View my portfolio!')
  i.fa.fa-link
  
// CodePen
a#codepen(href='https://codepen.io/andytran/' title='Follow me!')
  i.fa.fa-codepen
  
// Scroll To Bottom
a#scrollToBottom(href='#tip' title='Check out the tutorial!')
  i.material-icons &#xE313;
!

CSS 

              
                // Main Colors
$accent: null;
$white: #ffffff;
$black: #000000;
$dark-gray: lighten($black, 20%);
$gray: lighten($black, 40%);
$light-gray: lighten($black, 60%);
$lighter-gray: lighten($black, 80%);

// Font Weight
$thin: 100;
$light: 300;
$regular: 400;
$semibold: 600;
$bold: 700;

// Pen Settings
$primary: #2c3e50;
$accent: #33b5e5;
$max-width: 460px;
$gutters: 24px;

// Mixins
$level: 1;

@mixin elevation($level) {
  @if $level == 1 {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  }

  @else if $level == 2 {
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
  }

  @else if $level == 3 {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
  }

  @else if $level == 4 {
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
  }

  @else if $level == 5 {
    box-shadow: 0 19px 38px rgba(0, 0, 0, 0.3), 0 15px 12px rgba(0, 0, 0, 0.22);
  }
}

body {
  background: #e9e9e9;
  color: $gray;
  font-family: 'RobotoDraft', 'Roboto', sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Pen Title */
.pen-title {
  padding: 50px 0;
  text-align: center;
  letter-spacing: 2px;

  h1 {
    margin: 0 0 20px;
    font-size: 48px;
    font-weight: 300;
    
    span {
      display: block;
      margin: 0 0 10px;
      color: $accent;
      font-size: 18px;
      font-weight: $semibold;
      text-transform: uppercase;
    }
  }

  span {
    font-size: 12px;

    .fa {
      color: $accent;
    }

    a {
      color: $accent;
      font-weight: 600;
      text-decoration: none;
    }
  }
}

/* Rerun */
.rerun {
  margin: 0 0 30px;
  text-align: center;

  a {
    cursor: pointer;
    display: inline-block;
    background: $accent;
    border-radius: 3px;

    @include elevation(1);

    padding: 10px 20px;
    color: $white;
    text-decoration: none;
    transition: .3s ease;

    &:hover {
      @include elevation(2);
    }
  }
}

/* Scroll To Bottom */
#codepen {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: $primary;
  width: 56px;
  height: 56px;
  border-radius: 100%;

  @include elevation(1);

  transition: .3s ease;
  color: $white;
  text-align: center;

  i {
    line-height: 56px;
  }

  &:hover {
    @include elevation(3);
  }
}

/* CodePen */
#portfolio {
  @extend #codepen;

  bottom: 96px;
  right: 36px;
  background: $accent;
  width: 44px;
  height: 44px;
  animation: buttonFadeInUp 1s ease;

  i {
    line-height: 44px;
  }
}

/* Container */
.container {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  max-width: 1140px;
  margin: 0 auto 100px;
  text-align: center;
}

/* Column */
.col {
  display: block;
  width: 50%;
  float: left;
}

/* Form Container */
.form-container {
  display: inline-block;
  text-align: center;

  p {
    padding: $gutters 0;
    color: $gray;
    font-size: 12px;

    a {
      color: $dark-gray;
      font-weight: $bold;
      text-decoration: none;
    }
  }
}

/* Form */
.form {
  display: block;
  background: $white;
  margin: 0 auto;
  padding: $gutters ($gutters * 2) ($gutters * 2);
  box-sizing: border-box;

  @include elevation(1);

  .header {
    padding: $gutters 0;
    text-align: center;

    h1 {
      display: none;
      color: $accent;
      font-size: 24px;

      &.active {
        display: block;
      }
    }
  }

  .footer {
    text-align: center;

    a {
      color: $gray;
      font-size: 12px;
      text-decoration: none;
    }
  }

  form {
    display: none;

    &.active {
      display: block;
    }
  }

  .form-group {
    position: relative;
    margin: 0 0 $gutters;

    &:last-of-type {
      margin: 0 0 ($gutters * 1.5);
    }

    label {
      display: none;
    }

    input {
      outline: 0;
      background: transparent;
      width: 100%;
      border: 0;
      border-bottom: 1px solid $light-gray;
      padding: $gutters / 2;
      font-size: 14px;
      box-sizing: border-box;

      &:valid,
      &:focus {
        color: $accent;

        ~ .line {
          background: $accent;
          width: 100%;
        }
      }
    }

    .line {
      position: absolute;
      bottom: 0;
      left: 0;
      background: transparent;
      width: 0%;
      height: 2px;
      transition: .6s ease;
    }
  }

  .button {
    cursor: pointer;
    position: relative;
    outline: none;
    background: $accent;
    width: 100%;
    margin: 0 0 $gutters;
    padding: ($gutters / 2) $gutters;
    border: 0;
    border-radius: 100px;
    color: $white;
    font-family: 'RobotoDraft', 'Roboto', sans-serif;
    font-size: 14px;
    font-weight: $semibold;
    text-align: center;
    text-transform: uppercase;
    overflow: hidden;

    &:hover {
      &:before {
        left: -10%;
      }
    }

    &:before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      background: rgba($white, 0.3);
      width: 60%;
      height: 100%;
      transform: skew(-45deg);
      transition: .3s ease;
    }
  }
}

.style-2 {
  .header {
    background: $accent;
    margin: (-$gutters) (-$gutters * 2) $gutters;
    padding: ($gutters * 2) $gutters;

    h1 {
      color: $white;
    }
  }

  .form-group {
    label {
      position: absolute;
      top: 12px;
      left: 12px;
      display: block;
      font-size: 14px;
      transition: .2s ease;
    }

    input {
      &:focus,
      &:valid {
        ~ label {
          font-size: 12px;
          text-transform: uppercase;
          transform: translate(-8px, -18px) scale(0.75);
        }
      }

      &::-webkit-input-placeholder {
        color: transparent;
      }
    }
  }

  .button {
    border-radius: 0;
  }
}

/* Tip */
#tip {
  max-width: 600px;
  border-radius: 3px;
  margin: 0 auto 100px;
  line-height: 1.7em;
  text-align: center;

  h1 {
    margin: 0 0 10px;
    color: $dark-gray;
    font-size: 24px;
    font-weight: 300;
  }

  p {
    margin: 0 0 10px;
    color: $gray;

    b {
      font-weight: $semibold;
    }
  }

  code {
    display: block;
    background: #232e34;
    margin: 0 0 100px;
    padding: 10px 20px;
    color: #CDD3DE;
    letter-spacing: 2px;
    text-align: left;

    h1 {
      dsplay: block;
      background: #263238;
      margin: -10px -20px 20px;
      padding: 10px 20px;
      color: #CDD3DE;
      font-size: 18px;

      &:before {
        content: '\f121';
        display: inline-block;
        margin: 0 10px 0 0;
        color: #546E7A;
        font: normal normal normal 14px/1 FontAwesome;
        font-size: inherit;
        text-rendering: auto;
        transform: translate(0, 0);
      }
    }

    p {
      margin: 0;
      color: inherit;

      &:nth-child(2) {
        color: #C3E88D;
      }

      &:nth-child(4),
      &:nth-child(8),
      &:nth-child(12) {
        margin: 0 0 0 ($gutters / 2);
      }

      &:nth-child(5),
      &:nth-child(6),
      &:nth-child(7),
      &:nth-child(9),
      &:nth-child(10),
      &:nth-child(11),
      &:nth-child(13) {
        margin: 0 0 0 $gutters;
      }

      span {
        color: #C38FE5;

        &:nth-child(2),
        &:nth-child(3),
        &:nth-child(4),
        &:nth-child(5),
        &:nth-child(6) {
          color: #FF5370;
        }
      }
    }
  }
}


@media (max-width: 768px) {
  .col {
    width: 100%;
  }
}
!

JS 

              
                // Toggle Function
$('.toggle').click(function(){
  $('form').animate({
    height: 'toggle',
    opacity: "toggle"
  }, "slow");
});
!
999px

Console