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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.

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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-.

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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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HTML 

              
                <p class="intro">
  What CSS property do you use to set the colour of a text block? If you said <em>color</em> you were … wrong! 
</p>
<p class="intro">
  Don’t take it too hard, though. It was a trick question. In typographic parlance, “color” refers to the visual density of a block of text. Here's a little sandbox where you can play with some of the properties that impact typographic color.
</p>

<h1>Font Weight</h1>
<div class="wrapper">
  
<div class="font-weight small">
  <h2>Light</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="font-weight medium">
  <h2>Normal</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="font-weight large">
  <h2>Heavy</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>
  
</div>

<h1>Tracking</h1>
<div class="wrapper">
<div class="letter-spacing small">
  <h2>Tight</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="letter-spacing medium">
  <h2>Normal</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="letter-spacing large">
  <h2>Wide</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

</div>

<h1>Word Spacing</h1>
<div class="wrapper">
<div class="word-spacing small">
  <h2>Tight</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="word-spacing medium">
  <h2>Normal</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="word-spacing large">
  <h2>Wide</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

</div>

<h1>Ledding</h1>
<div class="wrapper">
  
<div class="line-height small">
  <h2>Tight</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="line-height medium">
  <h2>Normal</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="line-height large">
  <h2>Double</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>
</div>

<h1>Justification</h1>
<div class="wrapper">
  
<div class="left">
  <h2>Ragged Right</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="justified">
  <h2>Justified</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>

<div class="justified-hyphen">
  <h2>Justified with Hyphenation</h2>
  <p>
Either the well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to wonder what was going to happen next. First, she tried to look down and make out what she was coming to, but it was too dark to see anything; then she looked at the sides of the well, and noticed that they were filled with cupboards and book-shelves; here and there she saw maps and pictures hung upon pegs. She took down a jar from one of the shelves as she passed; it was labelled <span>`ORANGE MARMALADE'</span>, but to her great disappointment it was empty: she did not like to drop the jar for fear of killing somebody, so managed to put it into one of the cupboards as she fell past it. 
  </p>
</div>
</div>
!

CSS 

              
                /*Let's play!*/

/*Font-weight*/
.font-weight.small {
  font-weight: 300;
}

.font-weight.medium {
  font-weight: 400;
}

.font-weight.large {
  font-weight: 600;
}

/*Letter-spacing*/
.letter-spacing.small, 
.letter-spacing.small span {
  letter-spacing: -0.05em;
}

.letter-spacing.medium, 
.letter-spacing.medium span {
  letter-spacing: 0;
}

.letter-spacing.large, 
.letter-spacing.large span {
  letter-spacing: 0.3em;
}

/*Word-spacing*/
.word-spacing.small {
  word-spacing: -0.2em;
}

.word-spacing.medium {
  word-spacing: 0em;
}

.word-spacing.large {
  word-spacing: 0.5em;
}

/*Line-height */
.line-height.small {
  line-height: 0.9;
}

.line-height.medium {
  line-height: 1.3;
}

.line-height.large {
  line-height: 2;
}

/* Justification */
.left {
  text-align: left;
}

.justified {
  text-align: justify;
}

.justified-hyphen {
  text-align: justify;
  hyphens: auto;
}

/*BONUS - play with letter-spacing on the all-caps ORANGE MARMALADE*/

span {
  letter-spacing: 0.025em;
}

/*Styles*/

* {
  box-model: border-box;
}

body {
  font-size: 16px;
  font-family: 'Cormorant Garamond', serif;
  line-height: 1.3;
  font-weight: 400;
  letter-spacing: 0;
}

.wrapper {
  width: 1080px;
  border-top: 2px solid #efefef;
  display: block;
  margin: 0 auto;
}

.wrapper:after {
  content: "";
  display: table;
  clear: both;
}

.wrapper div {
  width: 300px;
  padding-right: 60px;
  padding-top: 30px;
  padding-bottom: 100px;
  float: left;
}

h1 {
  display: block;
  width: 1080px;
  margin: 0 auto;
  padding: 15px;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  font-variant-ligatures: none;
  font-weight: 700;
  font-size: 32px;
}

h2 {
  display: block;
  padding-bottom: 15px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-variant-ligatures: none;
  font-weight: 700;
  font-size: 16px;
  margin: 0;
}

p {
  padding: 0;
  margin: 0;
}

p.intro {
  max-width: 1080px;
  margin: 0 auto;
  padding-bottom: 12px;
  font-size: 24px;
}

p.intro:first-of-type {
  padding-top: 100px;
}

p.intro:last-of-type {
  padding-bottom: 100px;
}

@media screen and (max-width: 1100px) {
  
  .intro, 
  h1,
  .wrapper {
    width: 600px;
    padding-bottom: 50px;
  }
  
  .intro:last-of-type,
  .wrapper div,
  h1{
    padding-bottom: 15px;
  }
  
  .wrapper div {
    display: block;
    float: none;
    width: 100%;
    margin: 0 auto;
  }
  
}

@media screen and (max-width: 680px) {
  
  body {
    padding: 35px;
  }
  
  .intro, 
  h1,
  .wrapper {
    width: 100%;
  }
  
  h1 {
    padding: 10px 0;
  }
  
}
!

JS
!
999px

Console