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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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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).

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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 

              
                  <div class="wrapper">
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
    
    
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
    
    
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
    
    
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
    
    
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
    
    
    
    <div class="block animatable bounceIn">bounceIn</div>
    <div class="block animatable bounceInLeft">bounceInLeft</div>
    <div class="block animatable bounceInRight">bounceInRight</div>
    
    <div class="block animatable fadeIn">fadeIn</div>
    <div class="block animatable fadeInDown">fadeInDown</div>
    <div class="block animatable fadeInUp">fadeInUp</div>
    
    <div class="block animatable moveUp">moveUp</div>
    
    <div class="block animatable fadeBgColor">fadeBgColor</div>
    
  </div>
!

CSS 

              
                body {
  background: #fff url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgAQMAAABJtOi3AAAABlBMVEX4+Pj09PQf/c7fAAAAGklEQVR4Xq3MIQEAAADDIPqX/kvMIMEWEm8O7b0/wewc/NcAAAAASUVORK5CYII=) repeat;
}

.block {
  height: 5em;
  line-height: 5em;
  width: 10em;
  background: #464646;
  color: #fdfdfd;
  text-align: center;
  margin: 1em auto;
  text-shadow: 0 0 1px #333; /* so one can see fadeBgColor properly */
}

.animatable {
  /* initially hide animatable objects */
  visibility: hidden;

  /* initially pause animatable objects their animations */
  animation-play-state: paused;
}

/* show objects being animated */
.animated {
  visibility: visible;

  animation-fill-mode: both;
  animation-duration: 1s;
  animation-play-state: running;
}

/* CSS Animations (extracted from http://glifo.uiparade.com/) */
@keyframes fadeIn {
  0%,
  60% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes fadeInDown {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes bounceInLeft {
  0% {
    opacity: 0;
    transform: translateX(-2000px);
  }
  60% {
    transform: translateX(20px);
  }
  80% {
    transform: translateX(-5px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes bounceInRight {
  0% {
    opacity: 0;
    transform: translateX(2000px);
  }
  60% {
    transform: translateX(-20px);
  }
  80% {
    transform: translateX(5px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes moveUp {
  0% {
    transform: translateY(40px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes fadeBgColor {
  0%,
  70% {
    background: none;
  }
  100% {
    background: #464646;
  }
}

.animated.animationDelay {
  animation-delay: 0.4s;
}
.animated.animationDelayMed {
  animation-delay: 1.2s;
}
.animated.animationDelayLong {
  animation-delay: 1.6s;
}
.animated.fadeBgColor {
  animation-name: fadeBgColor;
}
.animated.bounceIn {
  animation-name: bounceIn;
}
.animated.bounceInRight {
  animation-name: bounceInRight;
}
.animated.bounceInLeft {
  animation-name: bounceInLeft;
}
.animated.fadeIn {
  animation-name: fadeIn;
}
.animated.fadeInDown {
  animation-name: fadeInDown;
}
.animated.fadeInUp {
  animation-name: fadeInUp;
}
.animated.moveUp {
  animation-name: moveUp;
}
!

JS 

              
                // Trigger CSS animations on scroll.
// Detailed explanation can be found at http://www.bram.us/2013/11/20/scroll-animations/

// Looking for a version that also reverses the animation when
// elements scroll below the fold again?
// --> Check https://codepen.io/bramus/pen/vKpjNP

jQuery(function($) {
  
  // Function which adds the 'animated' class to any '.animatable' in view
  var doAnimations = function() {
    
    // Calc current offset and get all animatables
    var offset = $(window).scrollTop() + $(window).height(),
        $animatables = $('.animatable');
    
    // Unbind scroll handler if we have no animatables
    if ($animatables.length == 0) {
      $(window).off('scroll', doAnimations);
    }
    
    // Check all animatables and animate them if necessary
		$animatables.each(function(i) {
       var $animatable = $(this);
			if (($animatable.offset().top + $animatable.height() - 20) < offset) {
        $animatable.removeClass('animatable').addClass('animated');
			}
    });

	};
  
  // Hook doAnimations on scroll, and trigger a scroll
	$(window).on('scroll', doAnimations);
  $(window).trigger('scroll');

});
!
999px

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