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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.

!
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).

Add External Stylesheets/Pens

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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.

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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

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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 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.

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HTML 

              
                <div id="pagehead">

  <div class="pagetext">
    <h3 class="top">Lorem Ipsum Dolor</h3>
    <h3 class="bottom">lorem Ipsum Dolor</h3>
  </div>

  <div class="pagedisolve" style="background-image:url('https://images.unsplash.com/photo-1604673809095-242bf2b47106?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ')">
  </div>

</div>

<div class="pagefill" style="background-image:url('https://images.unsplash.com/photo-1604673809095-242bf2b47106?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ">
</div>

<div id="dia" class="mpcontent content-nomarg">

  <blockquote class="wp-block-quote animation-element">
    <p>In semper ultricies imperdiet. Sed in nibh at tortor lacinia varius a non diam. Aliquam pulvinar sem at dolor mattis tincidunt.</p>
  </blockquote>

  <div class="wp-block-group side-text">
    <div class="wp-block-group__inner-container">
      <p class="animation-element">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla id justo ac lorem pharetra tempus id non augue. Proin orci arcu, tempus sed massa id, convallis dictum nisi. Mauris lobortis bibendum lacus id laoreet. Proin quis mollis massa. Aliquam et sapien vitae velit volutpat pellentesque ac eu dui. Vivamus sit amet sapien condimentum, fringilla metus vel, hendrerit augue. Nunc finibus auctor sapien et viverra. Fusce id magna vestibulum, viverra magna nec.

      </p>

      <p class="animation-element">Semper ex. Duis eu elit volutpat, malesuada arcu sit amet, posuere dolor. Mauris nec nisl at risus efficitur porta. Donec ac turpis metus. Duis eget tristique nunc. Sed et erat efficitur, dignissim justo sit amet, efficitur turpis. Nunc molestie eros ac lectus bibendum, nec fermentum eros eleifend. Fusce et felis in nisi volutpat lacinia sed vel lectus.</p>
    </div>
  </div>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Signika+Negative:300,400&display=swap");

body {
  background: #02253b;
  font-family: "Signika Negative", sans-serif;
  font-weight: 300;
  margin: 0;
  padding: 0;
  position: relative;
  overflow-x: hidden;
}

.pagefill {
  height: 100vh;
  text-align: center;
  background-size: cover;
  background-position: center;

  background-attachment: fixed;

  color: transparent;
  mask-image: url("https://assets.codepen.io/5346986/natural.png");
  mask-position: center;
  -webkit-mask-position: center;
  mask-repeat: no-repeat;
  -webkit-mask-image: url("https://assets.codepen.io/5346986/natural.png");
  -webkit-mask-repeat: no-repeat;
  mask-size: 720px;
  -webkit-mask-size: 720px;
}
.pagedisolve {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100vh;
  background-size: cover;
  background-position: center;

  background-attachment: fixed;

  color: transparent;
}

.pagetext {
  position: absolute;
  top: 0;
  left: 0;
  height: 100vh;
  text-align: center;
  width: 100%;
}
.pagetext h3 {
  font-weight: normal;
  position: absolute;
  color: #fff;
  z-index: 9999;
  font-family: "Arial";
  font-size: 26px;
}
.pagetext h3.top {
  text-align: left;
  top: 30%;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: 900px;
  opacity:0;
}
.pagetext h3.bottom {
  text-align: right;
  bottom: 30%;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: 900px;
    opacity:0;
}

.content {
  height: 100vh;
  color: #fff;
  margin: 150px auto 150px;
  position: relative;
  line-height: 1.2;
  margin-top: calc(150px - 100vh);
}
.mpcontent {
  max-width: 800px;
  height: 100vh;
  color: #fff;
  margin: 150px auto 150px;
  position: relative;
}
.mpcontent.content-nomarg {
  margin-top: 0;
  padding-bottom: 500px;
}
.mpcontent blockquote {
  float: left;
  width: 48%;
  margin-right: 5%;
  font-size: 34px;
  text-align: right;
}
.mpcontent .side-text {
  margin-top: 200px;
  width: 41%;
  float: left;
}
!

JS 

              
                // gsap.to()... infinity and beyond!
// For more check out greensock.com

gsap.registerPlugin(ScrollTrigger);

var tl = gsap.timeline({
  scrollTrigger: {
    trigger: "#pagehead",
    start: "top top",
    end: "+=100%",
    pin: true,
    scrub: 1,
    markers: true
  }
});

tl.addLabel("dia")
  .to(".pagedisolve", { duration: 1, autoAlpha: 0 }, 1)
  .to(".pagetext h3.top", { duration: 1, autoAlpha: 1 }, 2)
  .to(".pagetext h3.bottom", { duration: 1, autoAlpha: 1 }, 3);

ScrollTrigger.create({
  trigger: "#pagehead",
  start: "top top",
  end: "+=100%",
  pin: ".pagefill",
  scrub: 1,
  markers: true,
  onLeave: () => {
    gsap.set(".pagefill", { yPercent: -100 });
  },
  onEnterBack: () => {
    gsap.set(".pagefill", { yPercent: 0 });
  }
});

var ta = gsap.timeline({
  scrollTrigger: {
    trigger: "#dia",
    start: "top top",
    end: "+=100%",
    pinspacer: false,
    pin: true,
    scrub: 1,
    toggleActions: "play reverse stop reverse",
    markers: false
  }
});

ta.addLabel("dias")

  .to("blockquote", { autoAlpha: 1 })
  .to("p", { autoAlpha: 1 }, "+=.5");
!
999px

Console