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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

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HTML 

              
                <div class="wrapper">
  <h1>Letter-like form with inline fields</h1>
  
  <form class="form__contact" action="">
    <fieldset>
      <p>Hey, Stranger!</p>
      <p>My name is <span class="form__field field--name" data-placeholder="your name" tabindex="1" contenteditable></span> and I'm writting tou you since I'm interested in <span class="form__field field--message" data-placeholder="your message" tabindex="2" contenteditable></span>.</p>
      <p>This is my <span class="form__field field--email" data-placeholder="email address" tabindex="3" contenteditable></span>.</p>
      <p>Hope to get in touch soon. Cheers!</p>
      <button type="submit" class="button button--xlarge" tabindex="4">Send message &#187;</button>
    </fieldset>
  </form>
</div>

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve">
  <defs>
    <filter id="blur0">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0 0" />
    </filter>
    <filter id="blur1">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0 5" />
    </filter>
    <filter id="blur2">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0 10" />
    </filter>
    <filter id="blur3">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0 15" />
    </filter>
    <filter id="blur4">
      <feGaussianBlur in="SourceGraphic" stdDeviation="0 20" />
    </filter>
  </defs>
</svg>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Roboto+Slab:400');
@import url('https://fonts.googleapis.com/css?family=Shadows+Into+Light');

$line-height: 40px;

::selection { 
  color: #fff;
  background: #9FBE5A;  
}

body {
  width: 100vw;
  height: 100%; 
  padding-bottom: 50px;
  overflow-x: hidden; 
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(to bottom, #16a085, #f4d03f) center / cover no-repeat;
}

h1 {
  margin-bottom: 75px;
  padding: 0 20vw;
  font: 400 56px 'Roboto Slab', serif;
  font-size: 56px;
  text-align: center;
  color: #fff;
}

// Form tag holds the torn paper border
.form__contact {
  max-width: 600px;
  margin: 0 auto;
  border-left: 30px solid white; 
  border-image: url(data:image/svg+xml;base64,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) 5% 100% repeat;
  border-image-width: 0px 0px 0px 30px;
  transform: translateY(100%);
  animation: init 1s ease-in-out forwards;
  
  fieldset {
    position: relative;
    margin: 0;
    padding: 30px 30px $line-height 80px;
    border: none;
    border-radius: 0 20px 20px 0;
    font: 24px 'Shadows Into Light', cursive;
    background: #fff linear-gradient(rgba(0,0,0,.1) 1px, transparent 0) 0 20px / 100% $line-height;
    
    &:after {
      position: absolute; 
      top: 0;
      left: 50px;
      content: '';
      height: 100%;
      width: 1px;
      border-left: double #E08183;
    }
  } 
  
	p {
    margin: 0 0 $line-height 0;
    line-height: $line-height;
    color: #333;
	}

	span {
		position: relative;
		line-height: $line-height;
	}

	button {
		margin-top: $line-height;
    float: right;
    border: none;
    font-family: 'Shadows Into Light', cursive;
    color: #E08183;
    background: transparent;
    cursor: pointer;
    transition: transform 0.25s ease;
    
    &:hover {
      transform: translateX(10px)
    }
	}
}

.form__field {
  display: inline;
  color: #7DB665;
  outline: none;

  &:empty {
    display: inline-block;
    color: #DDD;
  }
  
  // Use a data-attr to replicate a placeholder
  &:empty,
  &:empty:focus {
    &:before {
      content: attr(data-placeholder);
    }
  }
}

// Hide blur defs
svg {
  display: none;
}

@keyframes init {
  75% {
    transform: translateY(-20px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes do-blur {
  0% {
    filter: url(#blur4);
  }
  
  25% {
    filter: url(#blur3);
  }
  
  50% {
    filter: url(#blur2);
  }
  
  75% {
    filter: url(#blur1);
  }
  
  100% {
    filter: url(#blur0); 
  }
}
!

JS 

              
                // Nope, no JS required :)
!
999px

Console