Pen Settings

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.

Learn more · Versions

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

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.

Learn more · Versions

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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

Powered by Algolia
About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

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.

Learn more

+ add another resource

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.

Powered by Algolia
About Packages

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

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

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <div id="snow"></div>
<h1 class="christmas">JOY to the World!</h1>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Mountains+of+Christmas:700);

body { 
background: #000854;
  background-size:100%; 
  height:100vh;
  background-repeat: no-repeat;
  overflow:hidden;
  margin:0;
  width:100%;
}
.christmas-blue {
color: #035ee2;
	background: -webkit-linear-gradient(transparent, transparent), url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/191814/blue_glitter.gif) repeat;
	background: -o-linear-gradient(transparent, transparent) !important;
	-webkit-background-clip: text !important;
	-webkit-text-fill-color: transparent !important;
	margin: 0;
	padding: 0;

	font-weight: 900;
	width: 100%;
	text-align: center;
	letter-spacing: 1px;
	z-index: 999999;
	-webkit-background-clip: text;
}

.christmas-gold {
	color: #D81E1E;
  
color: gold;
	background: -webkit-linear-gradient(transparent, transparent), url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/191814/gold_glitter.gif) repeat;
	background: -o-linear-gradient(transparent, transparent) !important;
	-webkit-background-clip: text !important;
	-webkit-text-fill-color: transparent !important;
	margin: 0;
	padding: 0;

	font-weight: 900;
	width: 100%;
	text-align: center;
	letter-spacing: 1px;
	z-index: 999999;
	-webkit-background-clip: text;
}



h1 {position:absolute;font-size: 8.5vw;
  width:100%;
  height:100%;
  text-align:center;
  max-height:100px;
  z-index:-1;
line-height:0;
  margin-top:150px;
  color:#fff;
	font-family: 'Mountains of Christmas', cursive;
}


/***************************

Snow.  

***************************/
.snow, .snow:before, .snow:after {

	position: absolute;
	top: -600px;
	left: 0;
	bottom: 0;
	right: 0;
	background-image: radial-gradient(5px 5px at 34px 172px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 86px 25px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 388px 47px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 53px 303px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 373px 475px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 196px 261px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 434px 424px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 234px 213px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 393px 356px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 537px 497px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 151px 362px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 110px 99px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 270px 111px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 351px 424px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 459px 279px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 584px 126px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 303px 486px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 132px 292px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 120px 162px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 396px 460px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 169px 508px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 177px 298px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 575px 410px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 29px 140px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 82px 378px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 482px 473px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 56px 24px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 157px 73px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 97px 496px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 240px 225px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 12px 102px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 518px 417px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 323px 155px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 534px 119px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 294px 245px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 270px 432px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 406px 292px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 42px 233px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 109px 160px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 158px 359px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 212px 133px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 303px 536px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 513px 314px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 54px 346px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 127px 115px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 559px 29px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 493px 581px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 339px 414px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 349px 481px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 331px 86px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 497px 385px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 65px 332px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 432px 593px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 377px 240px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 293px 224px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 455px 336px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 93px 50px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 129px 453px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 393px 78px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 364px 75px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 66px 19px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 254px 199px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 178px 454px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 499px 280px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 419px 40px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 179px 593px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 66px 529px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 498px 329px, #ffffff 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 381px 464px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 172px 17px, #ffffff 50%, rgba(0, 0, 0, 0));
	background-size: 600px 600px;
	animation: snow 5s linear infinite;
}
#snow {
	background: none;
	z-index: -1;
	background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/191814/flake1.png'), url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/191814/flake2.png'), url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/191814/flake3.png');
	height: 100%;
	left: 0;
	position: absolute;
	top: 0;
	width: 100%;
	-webkit-animation: snow 10s linear infinite;
	-moz-animation: snow 10s linear infinite;
	-ms-animation: snow 10s linear infinite;
	animation: snow 10s linear infinite;
}
@keyframes snow {
 0% {
background-position: 0px 0px, 0px 0px, 0px 0px;
}
 50% {
background-position: 500px 500px, 100px 200px, -100px 150px;
}
 100% {
background-position: 500px 1000px, 200px 400px, -100px 300px;
}
}
@-moz-keyframes snow {
 0% {
background-position: 0px 0px, 0px 0px, 0px 0px;
}
 50% {
background-position: 500px 500px, 100px 200px, -100px 150px;
}
 100% {
background-position: 400px 1000px, 200px 400px, 100px 300px;
}
}
@-webkit-keyframes snow {
 0% {
background-position: 0px 0px, 0px 0px, 0px 0px;
}
 50% {
background-position: 500px 500px, 100px 200px, -100px 150px;
}
 100% {
background-position: 500px 1000px, 200px 400px, -100px 300px;
}
}
@-ms-keyframes snow {
 0% {
background-position: 0px 0px, 0px 0px, 0px 0px;
}
 50% {
background-position: 500px 500px, 100px 200px, -100px 150px;
}
 100% {
background-position: 500px 1000px, 200px 400px, -100px 300px;
}
}
!

JS 

              
                

$.fn.christmas = function() {
  $(this).each(function() {
    $(this).html($(this).text().split("").map(function(v, i) {
      return '<span class="christmas-' + (i % 2 == 0 ? 'gold' : 'blue') + '">' + v + '</span>';
    }).join(""));
  });
};

$(function() { 
  $('h1.christmas').christmas();
});
!
999px

Console