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HTML

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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

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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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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.

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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 

              
                <!-- modified fork of https://codepen.io/dudleystorey/pen/sjvCA and  https://codepen.io/rishabhsrao/pen/fzhDH -->

<section class="frameTransparent">
    
    <img class="frameMat" src="http://placekitten.com/1600/1600/" />
     
</section>
!

CSS 

              
                .frameTransparent {
  /*slanted rainbow background */
  background-image: -webkit-linear-gradient(45deg, #b145c7 9%, #7646d6 9%, #7646d6 18%, #4a5adb 18%, #4a5adb 27%, #4a78e4 27%, #4a78e4 36%, #3a9dcf 36%, #3a9dcf 45%, #38bf73 45%, #38bf73 54%, #80c83b 54%, #80c83b 63%, #cad839 63%, #cad839 72%, #e7ba37 72%, #e7ba37 81%, #e77337 81%, #e77337 90%, #e9411f 90%, #e9411f 100%, #b145c7 100%);
  background-image: linear-gradient(45deg, #b145c7 9%, #7646d6 9%, #7646d6 18%, #4a5adb 18%, #4a5adb 27%, #4a78e4 27%, #4a78e4 36%, #3a9dcf 36%, #3a9dcf 45%, #38bf73 45%, #38bf73 54%, #80c83b 54%, #80c83b 63%, #cad839 63%, #cad839 72%, #e7ba37 72%, #e7ba37 81%, #e77337 81%, #e77337 90%, #e9411f 90%, #e9411f 100%, #b145c7 100%);
  padding:11px 0;
}

.frameMat { 
  width: 99%; height: auto; display: block; 
  margin: 0% auto; padding: 5%;
  border: 6px double rgba(197,197,197,.7);
  -webkit-box-shadow: 

    /*inside picture frame, after double border */
    0 0 0 2.5vw rgba(193,193,194,.8) inset, 

    /*inside picture frame, after double border - inset overlay*/
    0 50px 60px rgba(255,50,20,.75) inset, 
    0 -50px 60px rgba(250,250,50,.75) inset,
    50px 0 60px rgba(50,20,250,.75) inset, 
    -50px 0 60px rgba(250,50,250,.75) inset,

    /*outer picture frame border*/
    0 0 0 11px rgba(83, 83, 83,.9);

  opacity:.85;  

}
!

JS
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999px

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