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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

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

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.

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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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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

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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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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 

              
                <figure class="snip1357">
  <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/pr-sample14.jpg" alt="pr-sample14" />
  <figcaption>
    <div class="border one">
      <div></div>
    </div>
    <div class="border two">
      <div></div>
    </div>
    <h3>Ingredia Nutrisha</h3>
    <p>All this modern technology just makes people try to do everything at once.</p>
  </figcaption>
  <a href="#"></a>
</figure>
<figure class="snip1357 hover"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/pr-sample12.jpg" alt="pr-sample12" />
  <figcaption>
    <div class="border one">
      <div></div>
    </div>
    <div class="border two">
      <div></div>
    </div>
    <h3>Malcolm Function</h3>
    <p>Why can't I ever build character at a Miami condo or a casino somewhere? </p>
  </figcaption>
  <a href="#"></a>
</figure>
<figure class="snip1357"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/pr-sample20.jpg" alt="pr-sample20" />
  <figcaption>
    <div class="border one">
      <div></div>
    </div>
    <div class="border two">
      <div></div>
    </div>
    <h3>Nathaneal Down</h3>
    <p>I think nighttime is dark so you can imagine your fears with less distraction. </p>
  </figcaption>
  <a href="#"></a>
</figure>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Ovo);
@import url(https://fonts.googleapis.com/css?family=Muli);
.snip1357 {
  font-family: 'Muli', Arial, sans-serif;
  position: relative;
  margin: 10px;
  padding: 0 0 0 20px;
  min-width: 230px;
  max-width: 315px;
  width: 100%;
  box-shadow: none !important;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  color: #ffffff;
  font-size: 16px;
}
.snip1357 * {
  -webkit-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}
.snip1357 img {
  max-width: 100%;
  vertical-align: top;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
}
.snip1357 .border {
  position: absolute;
  opacity: 0.45;
  z-index: 1;
}
.snip1357 .border:before,
.snip1357 .border:after,
.snip1357 .border div:before,
.snip1357 .border div:after {
  background-color: #f5b043;
  position: absolute;
  content: "";
  display: block;
  -webkit-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}
.snip1357 .border:before,
.snip1357 .border:after {
  width: 0;
  height: 1px;
}
.snip1357 .border div:before,
.snip1357 .border div:after {
  width: 1px;
  height: 0;
}
.snip1357 .border.one {
  left: -6px;
  top: -6px;
  right: 6px;
  bottom: 6px;
}
.snip1357 .border.one:before,
.snip1357 .border.one div:before {
  left: 0;
  top: 0;
}
.snip1357 .border.one:after,
.snip1357 .border.one div:after {
  bottom: 0;
  right: 0;
}
.snip1357 .border.two {
  left: 6px;
  top: 6px;
  right: -6px;
  bottom: -6px;
}
.snip1357 .border.two:before,
.snip1357 .border.two div:before {
  right: 0;
  top: 0;
}
.snip1357 .border.two:after,
.snip1357 .border.two div:after {
  bottom: 0;
  left: 0;
}
.snip1357 figcaption {
  left: 0px;
  top: 20px;
  position: absolute;
  padding: 25px;
  margin: 6px;
  background-color: #000000;
  max-width: 70%;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
}
.snip1357 h3,
.snip1357 p {
  margin: 0;
}
.snip1357 h3 {
  font-family: 'Ovo', Arial, sans-serif;
  font-weight: 400;
  font-size: 1.5em;
  margin-bottom: 5px;
}
.snip1357 p {
  line-height: 1.6em;
  letter-spacing: 1px;
  font-size: 0.9em;
}
.snip1357 a {
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  position: absolute;
  z-index: 1;
}
.snip1357:hover .border:before,
.snip1357.hover .border:before,
.snip1357:hover .border:after,
.snip1357.hover .border:after {
  width: 100%;
}
.snip1357:hover .border div:before,
.snip1357.hover .border div:before,
.snip1357:hover .border div:after,
.snip1357.hover .border div:after {
  height: 100%;
}
!

JS 

              
                /* Demo purposes only */
$(".hover").mouseleave(
  function () {
    $(this).removeClass("hover");
  }
);
!
999px

Console