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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.

!
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

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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 

              
                <!--
Follow me on
Dribbble: https://dribbble.com/supahfunk
Twitter: https://twitter.com/supahfunk
Codepen: https://codepen.io/supah/

Picture by Ales Krivec https://unsplash.com/photos/ZSI-wuA49T0
-->

<div class="page">
  <header>
    <div class="logo"><svg><use xlink:href="#logo-dailyui"></use></svg></div>
    <nav></nav>
    <div class="search"><svg><use xlink:href="#ico-search"></use></svg></div>
  </header>
  <div class="content">
    <h1>404</h1>
    <h2>Page not found</h2>
    <p>I tried to catch some fog, but i mist</p>
    <a>back to home</a>
  </div>
    <img src="http://www.supah.it/dribbble/008/008.jpg" />
</div>

<!-- Logo -->
<svg  xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="display:none;">
  <symbol id="logo-dailyui" viewBox="0 0 61 14">
<g>
	<g>
		<path fill-rule="evenodd" clip-rule="evenodd" fill="#525C7C" d="M29.117,0.98h-1.846l-2.407,11.551h6.045l0.334-1.62h-4.198
			L29.117,0.98z M40.132,0.98l-3.365,5.285l-1.2-5.285h-1.885l1.854,7.182l-0.926,4.369h1.854l0.889-4.337l4.853-7.214H40.132z
			 M8.529,2.125C7.771,1.362,6.688,0.98,5.282,0.98H2.407L0,12.531h3.124c1.339,0,2.505-0.286,3.497-0.861
			c0.992-0.573,1.748-1.392,2.267-2.457c0.52-1.063,0.779-2.309,0.779-3.737C9.667,4.006,9.288,2.889,8.529,2.125z M7.201,8.351
			c-0.366,0.821-0.892,1.46-1.577,1.913c-0.686,0.452-1.488,0.679-2.407,0.679H2.166L3.934,2.56h1.137
			c0.873,0,1.537,0.254,1.994,0.762S7.751,4.57,7.751,5.539C7.751,6.592,7.567,7.53,7.201,8.351z M20.128,12.531h1.831L24.382,0.98
			H22.55L20.128,12.531z M15.314,0.964l-6.1,11.567h1.979l1.627-3.208H16.6l0.319,3.208h1.823L17.448,0.964H15.314z M13.632,7.68
			l1.339-2.655c0.452-0.885,0.821-1.693,1.106-2.425c0,0.274,0.015,0.642,0.043,1.102c0.029,0.461,0.147,1.787,0.354,3.979H13.632z
			 M44.33,0l-2.662,14h16.67L61,0H44.33z M52.584,8.584c-0.265,1.279-0.755,2.229-1.473,2.849c-0.719,0.62-1.67,0.931-2.854,0.931
			c-1.025,0-1.816-0.254-2.376-0.762c-0.561-0.508-0.839-1.236-0.839-2.19c0-0.397,0.047-0.805,0.141-1.222l1.367-6.473h1.679
			l-1.359,6.501c-0.1,0.422-0.149,0.801-0.149,1.136c0,0.488,0.141,0.867,0.422,1.139c0.28,0.271,0.707,0.405,1.277,0.405
			c0.685,0,1.229-0.192,1.63-0.577c0.401-0.386,0.694-1.013,0.879-1.88l1.408-6.724h1.68L52.584,8.584z M56.034,12.221h-1.665
			l2.203-10.504h1.664L56.034,12.221z"/>
	</g>
</g>
  </symbol>
  <symbol id="ico-search">
    <path fill-rule="evenodd" clip-rule="evenodd" fill="#4F5269" d="M14.769,14.769c-0.342,0.342-0.896,0.342-1.237,0l-3.756-3.756
	c-2.399,1.793-5.801,1.623-7.981-0.557c-2.392-2.392-2.392-6.271,0-8.663s6.271-2.392,8.662,0c2.18,2.181,2.35,5.583,0.557,7.981
	l3.756,3.756C15.11,13.873,15.11,14.427,14.769,14.769z M9.219,3.032c-1.709-1.709-4.479-1.709-6.188,0
	c-1.708,1.708-1.708,4.479,0,6.188c1.709,1.708,4.479,1.708,6.188,0C10.927,7.51,10.927,4.74,9.219,3.032z"/>
  </symbol>
</svg>
!

CSS 

              
                @mixin center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/*--------------------
Body
--------------------*/
html,
body {
  height: 100%;
  background: linear-gradient(0, #202239, #8595AC);
}
::selection {
  background: #CDD4DE;
}

/*--------------------
Page
--------------------*/
.page {
  @include center;
  width: 800px;
  height: 600px;
  z-index: 1;
  font-family: Roboto, sans-serif;
  background: #0D0C1E;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, .3);
}


/*--------------------
Header
--------------------*/
header {
  padding: 30px;
  
  .logo {
    margin: 0 auto;
    text-align: center;
    margin-bottom: -17px;
    
    svg {
      width: 61px;
      height: 14px;
    }
  }
  
  nav {
    cursor: pointer;
    width: 18px;
    height: 18px;
    position: relative;
    float: left;
    
    &::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: #565c73;
      border-radius: 2px;
      box-shadow: 0 5px 0 #565c73, 0 10px 0 #565c73;
    }
  }
  
  .search {
    float: right;
    cursor: pointer;
    
    svg {
      width: 16px;
      height: 16px;
    }
  }
}


/*--------------------
Content
--------------------*/
.content {
  text-align: center;
  padding-top: 118px;
  color: #CDD4DE;
  
  h1 {
    font-weight: 900;
    font-size: 165px;
    line-height: 1;
    margin-bottom: -10px;
    opacity: 0.6;
  }
  
  h2 {
    font-weight: 700;
    font-size: 34px;
    margin-bottom: 6px;
    opacity: 0.9;
  }
  
  p {
    font-weight: 300;
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 140px;
  }
  
  a {
    display: inline-block;
    font-weight: 300;
    font-size: 12px;
    text-transform: uppercase;
    border: 1px solid #CDD4DE;
    padding: 8px 14px;
    border-radius: 4px;
    opacity: 0.4;
    cursor: pointer;
  }
}


/*--------------------
Image
--------------------*/
img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  z-index: -1;
  transform: scale(1.1);
}
!

JS 

              
                var lFollowX = 0,
    lFollowY = 0,
    x = 0,
    y = 0,
    friction = 1 / 30;

function animate() {
  x += (lFollowX - x) * friction;
  y += (lFollowY - y) * friction;
  
  translate = 'translate(' + x + 'px, ' + y + 'px) scale(1.1)';

  $('img').css({
    '-webit-transform': translate,
    '-moz-transform': translate,
    'transform': translate
  });

  window.requestAnimationFrame(animate);
}

$(window).on('mousemove click', function(e) {

  var lMouseX = Math.max(-100, Math.min(100, $(window).width() / 2 - e.clientX));
  var lMouseY = Math.max(-100, Math.min(100, $(window).height() / 2 - e.clientY));
  lFollowX = (20 * lMouseX) / 100; // 100 : 12 = lMouxeX : lFollow
  lFollowY = (10 * lMouseY) / 100;

});

animate();
!
999px

Console