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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

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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).

Add External Stylesheets/Pens

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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 

              
                <?xml version="1.0" encoding="utf-8"?>
<svg version="1.1" id="error-404-img" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px"
	 y="0px" viewBox="0 0 344.7 276.7" style="enable-background:new 0 0 344.7 276.7;" xml:space="preserve">
<style type="text/css">
	.st0{fill:#4C423B;}
	.st1{opacity:0.2;}
	.st2{fill:#FFFFFF;}
	.st3{fill:rgba(132, 121, 114, .4);}
	.st4{fill:#424242;}
	.st5{fill:#E0E0E0;}
	.st6{fill:#BDBDBD;}
	.st7{opacity:0.64;fill:#212121;}
	.st8{fill:#F5F5F5;}
	.st9{opacity:0.8;fill:#4C423B;}
</style>
<g id="decorations">
	<polygon class="st0" points="245,52.8 241.7,49.5 238.5,52.6 235.4,49.5 232.1,52.8 235.2,55.9 232.1,59.1 235.4,62.4 238.5,59.2
		241.7,62.4 245,59.1 241.8,55.9 	"/>
	<polygon class="st0" points="42.7,172 39.4,168.7 36.2,171.8 33.1,168.7 29.8,172 32.9,175.1 29.8,178.3 33.1,181.6 36.2,178.4
		39.4,181.6 42.7,178.3 39.5,175.1 	"/>
	<polygon class="st0" points="102.9,30.8 99.6,27.5 96.4,30.7 93.3,27.5 90,30.8 93.1,34 90,37.2 93.3,40.5 96.4,37.3 99.6,40.5
		102.9,37.2 99.8,34 	"/>
	<polygon class="st0" points="311,196.3 307.7,192.9 304.5,196.1 301.4,192.9 298.1,196.3 301.2,199.4 298.1,202.6 301.4,205.9
		304.5,202.7 307.7,205.9 311,202.6 307.9,199.4 	"/>
	<g>
		<path class="st0" d="M42.7,67.2c-2.7,0-4.8-2.2-4.8-4.8c0-2.7,2.2-4.8,4.8-4.8c2.7,0,4.8,2.2,4.8,4.8
			C47.5,65.1,45.4,67.2,42.7,67.2z M42.7,59.6c-1.6,0-2.8,1.3-2.8,2.8s1.3,2.8,2.8,2.8s2.8-1.3,2.8-2.8S44.3,59.6,42.7,59.6z"/>
	</g>
	<g>
		<path class="st0" d="M183.1,23.3c-2.7,0-4.8-2.2-4.8-4.8s2.2-4.8,4.8-4.8c2.7,0,4.8,2.2,4.8,4.8S185.8,23.3,183.1,23.3z
			 M183.1,15.7c-1.6,0-2.8,1.3-2.8,2.8s1.3,2.8,2.8,2.8s2.8-1.3,2.8-2.8S184.7,15.7,183.1,15.7z"/>
	</g>
	<g>
		<path class="st0" d="M318.6,91c-2.7,0-4.8-2.2-4.8-4.8c0-2.7,2.2-4.8,4.8-4.8c2.7,0,4.8,2.2,4.8,4.8C323.5,88.9,321.3,91,318.6,91
			z M318.6,83.4c-1.6,0-2.8,1.3-2.8,2.8s1.3,2.8,2.8,2.8s2.8-1.3,2.8-2.8S320.2,83.4,318.6,83.4z"/>
	</g>
	<g>
		<path class="st0" d="M257,170.8c-2.7,0-4.8-2.2-4.8-4.8c0-2.7,2.2-4.8,4.8-4.8c2.7,0,4.8,2.2,4.8,4.8
			C261.8,168.7,259.6,170.8,257,170.8z M257,163.2c-1.6,0-2.8,1.3-2.8,2.8s1.3,2.8,2.8,2.8s2.8-1.3,2.8-2.8S258.5,163.2,257,163.2z"
			/>
	</g>
	<g>
		<path class="st0" d="M90,232c-2.7,0-4.8-2.2-4.8-4.8c0-2.7,2.2-4.8,4.8-4.8c2.7,0,4.8,2.2,4.8,4.8C94.8,229.8,92.6,232,90,232z
			 M90,224.3c-1.6,0-2.8,1.3-2.8,2.8s1.3,2.8,2.8,2.8s2.8-1.3,2.8-2.8S91.5,224.3,90,224.3z"/>
	</g>
	<circle class="st0" cx="98.9" cy="65.3" r="9"/>
	<circle class="st0" cx="103.3" cy="168.8" r="4.5"/>
	<path class="st0" d="M332.5,154.2c0,2.5-2,4.5-4.5,4.5s-4.5-2-4.5-4.5c0-2.5,2-4.5,4.5-4.5S332.5,151.8,332.5,154.2z"/>
	<path class="st0" d="M17.3,96.3c0,2.5-2,4.5-4.5,4.5c-2.5,0-4.5-2-4.5-4.5s2-4.5,4.5-4.5C15.3,91.8,17.3,93.9,17.3,96.3z"/>
	<path class="st0" d="M243.1,96.3c0,2.5-2,4.5-4.5,4.5c-2.5,0-4.5-2-4.5-4.5s2-4.5,4.5-4.5C241,91.8,243.1,93.9,243.1,96.3z"/>
	<circle class="st0" cx="229.1" cy="222.3" r="6.8"/>
</g>
<g id="_x34_-gauche">
	<g class="st1">
		<path class="st0" d="M60.6,168.4v-21.1H19.3v-16.8l47.4-60.8h12.9v60.7H92v17H79.5v21.1H60.6z M38.2,130.3h24.5v-32L38.2,130.3z"
			/>
	</g>
	<g>
		<path class="st2" d="M58.6,166.4v-21.1H17.3v-16.8l47.4-60.8h12.9v60.7H90v17H77.5v21.1H58.6z M36.2,128.3h24.5v-32L36.2,128.3z"
			/>
	</g>
</g>
<path id="ombre-loupe" class="st3" d="M238.6,173l0.4-0.3c0.6-0.5,0.6-1.4,0.1-1.9l-7.6-8.3c7.8-9.8,12.7-22.1,13.3-35.6
	c1.5-34.1-24.9-62.9-58.9-64.4c-34.1-1.5-62.9,24.9-64.4,58.9c-1.5,34.1,24.9,62.9,58.9,64.4c13.5,0.6,26.2-3.2,36.7-10.1l7.6,8.3
	c0.5,0.6,1.4,0.6,1.9,0.1l0.4-0.3l56.2,61.4h21.4L238.6,173z"/>
<g id="_x34_-droite">
	<g class="st1">
		<path class="st0" d="M281.3,168.4v-21.1H240v-16.8l47.4-60.8h12.9v60.7h12.4v17h-12.4v21.1H281.3z M259,130.3h24.5v-32L259,130.3z
			"/>
	</g>
	<g>
		<path class="st2" d="M279.3,166.4v-21.1H238v-16.8l47.4-60.8h12.9v60.7h12.4v17h-12.4v21.1H279.3z M257,128.3h24.5v-32L257,128.3z
			"/>
	</g>
</g>

<g id="loupe">
	<path class="st4" d="M311.4,252.6L219.8,161L208,172.8l91.6,91.6c3.4,3.4,9.1,3.2,12.2-0.5h0C314.6,260.5,314.4,255.6,311.4,252.6z
		"/>
	<path class="st5" d="M199.5,167.1l11.1,11.1c0.6,0.6,1.5,0.6,2,0l12.5-12.5c0.6-0.6,0.6-1.5,0-2l-11.1-11.1L199.5,167.1z"/>
	<polygon class="st6" points="215.8,154.2 217.2,155.7 205.4,173 200.2,167.8 	"/>
	<polygon class="st7" points="213,177.8 224.8,166 225.6,166.8 216.4,181.1 	"/>
	<path class="st8" d="M164,51.9c-36,0-65.1,29.2-65.1,65.1s29.2,65.1,65.1,65.1s65.1-29.2,65.1-65.1S200,51.9,164,51.9z M164,168.7
		c-28.5,0-51.7-23.1-51.7-51.7c0-28.5,23.1-51.7,51.7-51.7s51.7,23.1,51.7,51.7C215.7,145.5,192.5,168.7,164,168.7z"/>
	<circle class="st9" cx="164" cy="117" r="51.7"/>
	<path class="st2" d="M129.7,82.7c-7.5,7.5-12,15.1-10,17c1.9,1.9,9.6-2.6,17-10c7.5-7.5,12-15.1,10-17
		C144.8,70.7,137.2,75.2,129.7,82.7z"/>
</g>
</svg>
!

CSS 

              
                body {
  background-color: rgba(198, 155, 109, .3);  
}
#error-404-img {
  max-width: 700px;
  display: block;
  margin: 0 auto;
}

#loupe {
	animation: bounceInUp 2s ease forwards;
	}


#ombre-loupe {
	animation: fadeIn 2s 3s ease forwards;
}

#_x34_-gauche, #_x34_-droite, #ombre-loupe, #decorations {
    opacity: 0;
}

#_x34_-gauche, #_x34_-droite {
	animation: fadeIn 2s ease forwards;
}

#_x34_-gauche {
	animation-delay: 1s;
}

#_x34_-droite {
	animation-delay: 2s;
}

#decorations {
  transform-origin: center;
  animation: fadeIn 2s ease forwards, rotate-grow 50s linear infinite alternate;
	animation-delay: 4s;
}

@-webkit-keyframes rotate-grow {
  from {
       -webkit-transform: rotate(0) scale(.8);
    transform: rotate(0) scale(.8);
  }

  to {
       -webkit-transform: rotate(360deg) scale(1.5);
    transform: rotate(360deg) scale(1.5);
  }
}

@keyframes rotate-grow {
  from {
       -webkit-transform: rotate(0) scale(.8);
    transform: rotate(0) scale(.8);
  }

  to {
       -webkit-transform: rotate(360deg) scale(1.5);
    transform: rotate(360deg) scale(1.5);
  }
}


@-webkit-keyframes fadeInLeft {
  from {
    opacity: 0;
    -webkit-transform: translate3d(-100%, 0, 0);
    transform: translate3d(-100%, 0, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}
@-webkit-keyframes fadeInRight {
  from {
    opacity: 0;
    -webkit-transform: translate3d(100%, 0, 0);
    transform: translate3d(100%, 0, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}



@keyframes fadeInRight {
  from {
    opacity: 0;
    -webkit-transform: translate3d(100%, 0, 0);
    transform: translate3d(100%, 0, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}


@keyframes fadeInLeft {
  from {
    opacity: 0;
    -webkit-transform: translate3d(-100%, 0, 0);
    transform: translate3d(-100%, 0, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}

@-webkit-keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@-webkit-keyframes bounceInUp {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 3000px, 0);
    transform: translate3d(0, 3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, -20px, 0);
    transform: translate3d(0, -20px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, 10px, 0);
    transform: translate3d(0, 10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  to {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}

@keyframes bounceInUp {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 3000px, 0);
    transform: translate3d(0, 3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, -20px, 0);
    transform: translate3d(0, -20px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, 10px, 0);
    transform: translate3d(0, 10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  to {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}

.bounceInUp {
  -webkit-animation-name: bounceInUp;
  animation-name: bounceInUp;
}
!

JS
!
999px

Console