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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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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. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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HTML 

            
              <div class="container">
  
  <div class="text__container">
    <h1>YouTube Video Background</h1>
    <p>Using the YouTube iFrame Player API,
       <br /> Does not work on iOS :(</p>
  </div>
  
  <div class="player__container">
    <div class="overlay"></div>
    <div id="player"></div>
  </div>
</div>
!

CSS 

            
              $bg_pattern: ' data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAATklEQVQYV2NkYGAwZmBgOMuAACA+CKCIMSIpADGRNaEYgKwQ3WQUjTCF6CYhWw2WAynEpgjmIpg7jUlSiM0TWK2GWUOUZ7ApxggeogIcABHJFtfoX9tJAAAAAElFTkSuQmCC'

$bg_image: 'https://i.ytimg.com/vi/1kKkRtVlwrM/maxresdefault.jpg'

$font_family: Frutiger, "Frutiger Linotype", Univers, Calibri, "Gill Sans", "Gill Sans MT", "Myriad Pro", Myriad, "DejaVu Sans Condensed", "Liberation Sans", "Nimbus Sans L", Tahoma, Geneva, "Helvetica Neue", Helvetica, Arial, sans-serif

*
  box-sizing: border-box

body
  margin: 0
  font-family: $font_family
  background-color: black
  background-image: url($bg_image)
  background-repeat: no-repeat
  background-size: cover cover
  height: 100%
  
  
.container
  max-height: 400px
  margin: 0 auto
  margin-top: 2em
  position: relative
  overflow: hidden
  width: 80%
  border: 6px solid rgba(#eee, .4)

  
.player__container
  position: relative
  padding-bottom: 56.25%
  height: 0
  overflow: hidden
  max-width: 100%

  .overlay
    height: 100%
    width: 100%
    display: block
    z-index: 1
    position: absolute
    background-color: rgba(blue, .2)
    background-repeat: repeat
    //background-image: url($bg_pattern) 
  
    
  iframe, embed, object
    position: absolute
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: -99
    //transform: translateY(-200px)
    
    
.text__container
  position: absolute
  padding: 2em
  height: 100%
  width: 100%
  z-index: 3
  
    
h1, p
  text-align: center
  color: white
  
  
h1
  font-size: 2.2em
  font-weight: 300
  text-transform: uppercase
  width: 100%
  
  
p
  font-size: 1.1em
  border: 3px solid rgba(white, .1)
  background-color: rgba(white ,.1)
  width: 40%
  min-width: 360px
  padding: 1em 2em
  margin: 0 auto
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JS 

            
              // https://developers.google.com/youtube/iframe_api_reference#Loading_a_Video_Player

var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";

var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

var player;
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '390',
    width: '640',
    videoId: 'KL6jwnIln6w',
    playerVars: {
      autoplay: 1,
      autohide: 1,
      controls: 0,
      iv_load_policy: 3,
      fs: 0,
      loop: 1,
      mute: 1,
      showinfo: 0,
      modestbrangin: 1,
    },
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerReady
    }
  });
}


function onPlayerReady(event) {
  event.target.playVideo();
  
  // disable audio
  player.mute();
}
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