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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).

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.

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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.

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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.

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.

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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.

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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 

              
                <ul class="box">
  <li class=free>Free Trial</li>
  <li class=try>Try it free for 21 days</li>
  <li class=start><a href="#">Start now!</a></li>
</ul>​
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Jockey+One);

body{padding:20px 80px 0;
background-color:#aaa;
  text-align:center;
}

.box{
  margin:0 auto;
  padding-top:1px;
  position:relative;
  text-align:center;  
  z-index:1;
}
.box li{
    list-style-type:none;
    /*margin:0 auto;/**/
}
.free{
  width:150px;
  height:122px;
  
  background:#2D2F2E; 
    /*
http://www.workwithcolor.com/hsl-color-schemer-01.htm?q=252726,282A29,2A2D2B,2D2F2E,2F3230,313533,343736,363A38,393C3B,3B3F3D
    */
  background:-webkit-linear-gradient(90deg,#252726 0,#313533 59.3%,#3B3F3D 100%);
  border-radius:75px;
  box-shadow:3px 3px 10px  rgba(0,0,0,.8);
  
  color:#E5FEA5;
  display:block;
  font-size:30px;
  font-family: 'Jockey One', serif;
  letter-spacing:-1px;
  margin:0;
  padding-top:28px;
  padding-bottom:0;
  position:relative;
  top:5px;
  text-transform:uppercase;
  z-index:2;
    
    opacity:1;
}
.try{
  color:#fff;
  font-family: Verdana;
  font-size:11px;
  letter-spacing:-1px;
  background:*#2D2F2E;
  background:-webkit-linear-gradient(90deg,#252726 0,#313533 100%);
  
  border-radius:14px 14px 75px 75px;
  height:89px;
  margin:0 auto;
  padding:0;
  position:absolute;
  top:67px;
  width:150px;
  z-index:3;
     opacity:1;
}
.start{
  color:#581B0C;
  font-family: 'Jockey One', serif;
  font-size:25px;
  letter-spacing:-1px;
  text-transform:uppercase;
  
  background:
    /*-webkit-linear-gradient(90deg,rgba(0,0,0,.3) 0,rgba(192,67,32,0) 10%)0 39px,*/
    -webkit-radial-gradient(ellipse closest-side, rgba(192,67,32,1) 50%, rgba(192,67,32,0) 50%)50% 62%;
  background-size:320px 320px;
  background-color:transparent;
  
  display:block;
  height:40px;
  left:-8px;
  margin:0;
  margin-top:10px;
  overflow:hidden;
  position:relative;
  top:-68px;
  width:165px;
  z-index:4;
    
    opacity:1;
}
.start a{
  color:inherit;
  text-decoration:inherit;
  display:block;
  width:165px;
  height:165px;
  border-radius:82.5px;
  border:0;
  padding:0;
  margin:0;
    background:#C04320;
  background:
    -webkit-linear-gradient(0deg,rgba(0,0,0,.2) 0,rgba(192,67,32,0) 50px,rgba(192,67,32,0) 115px,rgba(0,0,0,.2) 165px),
    -webkit-linear-gradient(90deg,rgba(0,0,0,.1) 0,rgba(192,67,32,0) 20px,rgba(192,67,32,0) 38px,rgba(255,255,255,.8) 39px,rgba(255,255,255,.1) 50px)0 141px;
  position:absolute;
  top:-102px;
  line-height:241px;
  text-shadow:1px 1px 1px rgba(255,255,255,.3);
    z-index:5;
    
    opacity:1;
}
.free:before{
    content:'.';
    display:block;
    height:0px;
    border:10px solid transparent;
    border-bottom-color:#021;
    position:absolute;
    top:67px;
    left:-6px;
    width:141px;
    
    opacity:1;
}
.free:after{
    content:'.';
    background:transparent;
    background:
       /* -webkit-linear-gradient(-55deg, #793532 17px, transparent 17px)-30px 19px,
        -webkit-linear-gradient(55deg, #793532 17px, transparent 17px)-30px 19px,*/
        -webkit-linear-gradient(
    0deg,rgba(121,53,50,0) 0,rgba(0,0,0,1) 45px,rgba(0,0,0,1) 165px,rgba(121,53,50,0) 208px
    /*,#793532 208px,#793532 234px*/
    ,transparent 234px);
    background-size:262px 38px;
    color:#000;
    overflow:hidden;
    display:block;
    height:38px;
    position:absolute;
    text-align:center;
    top:77px;
    left:-30px;
    width:262px;
    
    opacity:1;
}

.box:before{
    content:'';
    display:block;
    height:0px;
    /*border:35px solid transparent;*/
    border:0px solid transparent;
    border-bottom:35px solid #793532;
    position:absolute;
    top:85px;
    left:0;
    width:225px;
    
    opacity:1;

}
/*
.box:after{
    content:'.';
    display:block;
    height:0px;
    border:35px solid transparent;
    border-top:25px solid #793532;
    position:absolute;
    top:83px;
    left:-56px;
    width:290px;
    
    opacity:1;

}*/
.try:before{
    content:'';
    width:150px;
  height:150px;
  border-radius:75px;
  box-shadow:
        inset 10px 12px 10px -10px rgba(255,255,255,.3),
        inset 2px 3px 0 rgba(0,0,0,.3);
  background:transparent; 
  display:block;
  margin:0;
  padding:0;
  position:absolute;
  top:-61px;
    
    opacity:1;
}​
!

JS
!
999px

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