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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.

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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).

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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 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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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                section
  figure
    img(src="https://images.unsplash.com/photo-1523978591478-c753949ff840?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=4a7ae67e32aeafa8fcef6002dc98dc01" alt="Mountains surrounding a body of water")
    figcaption The water was freezing!

  figure
    img(src="https://images.unsplash.com/photo-1504217051514-96afa06398be?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=4c2699a4a22cc550d845fdbc25b676d7" alt="Sun setting over the mountains")
    figcaption The sunset was beautiful that day.

  figure
    img(src="https://images.unsplash.com/photo-1430778643786-afad072a0bb1?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=a2f7f06ab7480af81b66d854ec7cfb90" alt="Countryside with tire tracks in grass")
    figcaption We roamed the countryside and noticed these tracks in the grass. So we followed.
    
  figure
    img(src="https://images.unsplash.com/photo-1448827067615-fa74e848e86c?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=882a9906c73a6e21b7614adfa0080c11" alt="A terrifying close-up of an insect")
    figcaption This was just terrifying. He wasn't that big...

  figure
    img(src="https://images.unsplash.com/photo-1510020553968-30f966e1ec9e?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=b06f39fc12490ec16b4603f87413a9d8" alt="Dog looking out car window")
    figcaption Benson looking pensive as usual.
    
  figure
    img(src="https://images.unsplash.com/photo-1469474968028-56623f02e42e?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=b5d101f72e23afc7e5d667ad09d555ad" alt="Person on mountaintop")
    figcaption We got lost for hours.

  figure
    img(src="https://images.unsplash.com/photo-1520247478381-4d32def223c1?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=8b4f951c5fb787428647e61369f23aa3" alt="Birds eye view of ocean waves")
    figcaption I jumped from the cliffside and plummeted deep into the waves.

  figure
    img(src="https://images.unsplash.com/photo-1507146426996-ef05306b995a?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=8f37819758fae3fecda8434f24eaaea0" alt="A cute golden retriever puppy")
    figcaption We met this cute little guy. Benson was not amused!
    
  figure
    img(src="https://images.unsplash.com/photo-1450045439515-ff27c2f2e6b1?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=97a25f2cb9d2cc37987223a2ca31ad3c" alt="Whale fin emerging from ocean")
    figcaption Whale watching... or were they watching us?
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CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Sue+Ellen+Francisco');

$spd: 0.6s;
$tf: cubic-bezier(0.645, 0.045, 0.355, 1);

@function rem($pixels, $context: 16) {
  @return #{$pixels/$context}rem;
}

* {
  box-sizing: border-box;
}

body {
  padding: rem(30);
  background-color: whitesmoke;
  font-family: 'Sue Ellen Francisco', serif;
}

section {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  grid-auto-rows: 300px;
  grid-gap: rem(30);
  margin: 0 auto;
  max-width: 1000px;
}

figure {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border-radius: rem(2);
  transform: translateY(0);
  transition: 
    transform $spd $tf,
    box-shadow $spd $tf;
  
  &:after {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    margin: auto;
    width: 100%;
    height: 100%;
    background-color: rgba(crimson, 0.8);
    opacity: 0;
    transition: opacity $spd ease;
  }
  
  &:nth-child(2),
  &:nth-child(4),
  &:nth-child(7) {
    grid-row: span 2;
  }
}

img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translateZ(0);
  transition: transform $spd $tf;
}

figcaption {  
  position: absolute;
  bottom: 0; left: 0;
  padding: rem(24) rem(36) rem(24) rem(18);
  width: 100%;
  color: white;
  font-size: rem(24);
  line-height: 1.2;
  letter-spacing: rem(0.5);
  z-index: 1;
  opacity: 0;
  transform: translateY(-12px) rotate(-3deg);
  transition: 
    opacity $spd $tf,
    transform $spd $tf;
}

// Hover transitions
figure:hover {
  transform: translateY(-6px);
  box-shadow: rgba(black, 0.5) 0 12px 24px -12px;

  &:after {
    opacity: 1;
  }

  img {
    transform: scale(1.05);
  }

  figcaption {
    opacity: 1;
    transform: translateY(0) rotate(-3deg);
  }
}
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JS
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999px

Console