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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>

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <ul class="grid">
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=1" alt="" />
			<div class="info">
				<p>Kitty 1</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=2" alt="" />
			<div class="info">
				<p>Kitty 2</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=3" alt="" />
			<div class="info">
				<p>Kitty 3</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=4" alt="" />
			<div class="info">
				<p>Kitty 4</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=5" alt="" />
			<div class="info">
				<p>Kitty 5</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=6" alt="" />
			<div class="info">
				<p>Kitty 6</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=7" alt="" />
			<div class="info">
				<p>Kitty 7</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=8" alt="" />
			<div class="info">
				<p>Kitty 8</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=9" alt="" />
			<div class="info">
				<p>Kitty 9</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=10" alt="" />
			<div class="info">
				<p>Kitty 10</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=11" alt="" />
			<div class="info">
				<p>Kitty 11</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=12" alt="" />
			<div class="info">
				<p>Kitty 12</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=13" alt="" />
			<div class="info">
				<p>Kitty 13</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=14" alt="" />
			<div class="info">
				<p>Kitty 14</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=15" alt="" />
			<div class="info">
				<p>Kitty 15</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=1" alt="" />
			<div class="info">
				<p>Kitty 16</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=2" alt="" />
			<div class="info">
				<p>Kitty 17</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=3" alt="" />
			<div class="info">
				<p>Kitty 18</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=4" alt="" />
			<div class="info">
				<p>Kitty 19</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=5" alt="" />
			<div class="info">
				<p>Kitty 20</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=6" alt="" />
			<div class="info">
				<p>Kitty 21</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=7" alt="" />
			<div class="info">
				<p>Kitty 22</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=8" alt="" />
			<div class="info">
				<p>Kitty 23</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=9" alt="" />
			<div class="info">
				<p>Kitty 24</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=10" alt="" />
			<div class="info">
				<p>Kitty 25</p>
			</div>
		</a>
	</li>
 <li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=11" alt="" />
			<div class="info">
				<p>Kitty 26</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=12" alt="" />
			<div class="info">
				<p>Kitty 27</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=13" alt="" />
			<div class="info">
				<p>Kitty 28</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=14" alt="" />
			<div class="info">
				<p>Kitty 29</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=15" alt="" />
			<div class="info">
				<p>Kitty 30</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=1" alt="" />
			<div class="info">
				<p>Kitty 31</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=2" alt="" />
			<div class="info">
				<p>Kitty 32</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=3" alt="" />
			<div class="info">
				<p>Kitty 33</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=4" alt="" />
			<div class="info">
				<p>Kitty 34</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=5" alt="" />
			<div class="info">
				<p>Kitty 35</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=6" alt="" />
			<div class="info">
				<p>Kitty 36</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=7" alt="" />
			<div class="info">
				<p>Kitty 37</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=8" alt="" />
			<div class="info">
				<p>Kitty 38</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=9" alt="" />
			<div class="info">
				<p>Kitty 39</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=10" alt="" />
			<div class="info">
				<p>Kitty 40</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=11" alt="" />
			<div class="info">
				<p>Kitty 41</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=12" alt="" />
			<div class="info">
				<p>Kitty 42</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=13" alt="" />
			<div class="info">
				<p>Kitty 43</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=14" alt="" />
			<div class="info">
				<p>Kitty 44</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=15" alt="" />
			<div class="info">
				<p>Kitty 45</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=1" alt="" />
			<div class="info">
				<p>Kitty 46</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=2" alt="" />
			<div class="info">
				<p>Kitty 47</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=3" alt="" />
			<div class="info">
				<p>Kitty 48</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=4" alt="" />
			<div class="info">
				<p>Kitty 49</p>
			</div>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="http://placekitten.com/200/200?image=5" alt="" />
			<div class="info">
				<p>Kitty 50</p>
			</div>
		</a>
	</li>
</ul>
!

CSS 

              
                body {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 16px;
  
  -webkit-font-smoothing		: antialiased
}

.grid {
  margin: 0 auto;
  padding: 0;
  width: 100%;
  max-width: 1000px;
}

.grid li {
  width: 10%;
  background: #000000;
  float: left;
  position: relative;
  overflow: hidden;
}

.grid img {
  float: left;
  width: 100%;
  height: auto;
  position: relative;
  
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
	 -webkit-transform: translate3d(0,0,0);
}

.grid .info {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 15px;
  background: #DC584C;
  display: none;
  z-index: 2;
  
  -webkit-transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
	 -webkit-transform: translate3d(0,0,0);
}

.grid p {
  font-size: 14px;
  font-weight: bold;
  color: #FFF;
}
!

JS 

              
                ###
Simple effect for roll over on grids, where the content slides based on the previous position.

You can see also in use here: http://worldbakingday.com

Libraries: jQuery and jQuery.transit
###

$ ->
  grid = $ ".grid"
  current = index:-1, column:0, line:0
  
  columns = 10
  easing = "cubic-bezier(0.165, 0.840, 0.440, 1.000)"
  time = 400
    
  grid.on "mouseenter", "a", (e) =>
    el = $ e.currentTarget
    info = el.find ".info"
    image = el.find "img"
    index = el.parent().index()
    column = index % columns
    line = Math.floor(index / columns)
    console.log index, column, line
    item = el:el, index:index, column:column, line:line, info:info, image:image
    
    # stop if the 
    return if current.el and current.index is index
  
    if line == current.line and column > current.column
      showItem item, "-100%", 0, "25%", 0
      hideItem current, "100%", 0, "-25%", 0
    else if line == current.line and column < current.column
      showItem item, "100%", 0, "-25%", 0
      hideItem current, "-100%", 0, "25%", 0
    else if line > current.line and column == current.column
      showItem item, 0, "-100%", 0, "25%"
      hideItem current, 0, "100%", 0, "-25%"
    else
      showItem item, 0, "100%", 0, "-25%"
      hideItem current, 0, "-100%", 0, "25%"
  
    current = item
  
  showItem = (item, infoX, infoY, imageX, imageY) ->
    item.info.stop().css(x:infoX, y:infoY, display:"block").transition x:0, y:0, duration:time, easing:easing
    item.image.stop().transition x:imageX, y:imageY, opacity:.5, duration:time, easing:easing
  
  hideItem = (item, infoX, infoY, imageX, imageY) ->
    return unless item.el
    item.info.stop().transition x:infoX, y:infoY, duration:time, easing:easing
    item.image.stop().css(x:imageX, y:imageY, opacity:.5).transition x:0, y:0, opacity:1, duration:time, easing:easing
!
999px

Console