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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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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

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                <div class="wrap">
  <div class="lineWrap intro centered">
    <h1 class="">Just <span>for</span> FUN!</h1>
  </div>
</div>

<!--  slide elements 02 ======== -->
<div class="fromLeft elemLeft02">
  <div class="lineWrap centered">
    <h1 class=""><span>no</span> 02</h1>
  </div>
</div>

<div class="fromRight elemRight02"></div>

<!--  slide elements 03 ======== -->
<div class="fromRight elemRight03a"></div>

<div class="fromRight elemRight03b">
  <div class="lineWrap centered">
    <h1 class=""><span>no</span> 03</h1>
  </div>
</div>

<!--  slide elements 04 ======== -->

<div class="slide slide04">
  <div class="fromTopLeft elemTopLeft04">
    <div class="lineWrap centered">
      <h1 class=""><span>no</span></h1>
    </div>
  </div>
  <div class="fromBottomRight elemBottomRight04">
    <div class="lineWrap centered">
      <h1 class="">04</h1>
    </div>
  </div>
</div>

<!--  slide 05 ======== -->
!

CSS 

              
                body, p {
  margin: 0;
  padding: 0;
  font-family:sans-serif;
  background-color:grey;
  overflow:hidden;
}
h1 {
  position: relative;
  font-weight: 800;
  font-size: 80px;
  line-height: 64px;
  color: #c1c1c1;
  margin: 0;
}
h1 span{
  font-size: 35px;
  margin: 0 -15px 0 -5px;
}
.lineWrap{
  position: absolute;
  top: 50%;
  left: 50%;
  width:100%;
  height: 64px;
  text-align:center;
  overflow: hidden;
}


.wrap{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:100vh;
}


.fromRight{
  position: absolute;
  top: 0;
  left: 100%;
  width: 50%;
  height: 100%;
  overflow: hidden;
}
.fromLeft{
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  overflow: hidden;
}
.fromTopLeft{
  position: absolute;
  top: -100%;
  left:0;
  width: 50%;
  height: 100%;
  overflow: hidden;
}
.fromBottomRight{
  position: absolute;
  top: 100%;
  left:50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
}
img{
  position: relative;
  height: 120%;
}

.intro h1{
  top:65px;
}

.elemLeft02{
  background-color:green;
}
.elemRight03a{
  z-index:-1;
    background-image: url(https://unsplash.it/1000/1000?image=766);
  background-repeat: no-repeat;
  background-size: cover;
}
.elemRight02{
  background-image: url(https://unsplash.it/1000/1200?image=889);
  background-repeat: no-repeat;
  background-size: cover;
  background-position-y: 42%;
}
.elemRight03b{
  height:50%;
  background-color:darkgrey;
}
.elemTopLeft04{
  background:grey;
}
.elemBottomRight04{
  background:grey;
}
!

JS 

              
                console.clear();

//defaultEase for all animations - except ...
TweenLite.defaultEase = Linear.easeNone;

TweenMax.set(".centered", {xPercent:-50, yPercent:-50});


var action = new TimelineMax()
.to('.intro h1',0.5,{top:0})

.addPause().addLabel('two')
.to('.intro h1',0.5,{y:65},'two')
.to('.elemRight02',0.5,{xPercent:-100,ease: Power2.easeOut},'two')
.to('.elemLeft02',0.5,{xPercent:200,ease: Power2.easeOut},'two')
.to('.elemLeft02',0.2,{scale:1.5, transformOrigin:'center', repeat:1, yoyo:true})
.to('.elemRight03a',0.5,{xPercent:-100,ease: Power2.easeOut},'two')

.addPause().addLabel('three')
.to('.elemLeft02',0.5,{xPercent:100,ease: Power2.easeOut},'three')
.to('.elemRight03a',0.5,{xPercent:-200,ease: Power2.easeOut},'three')
.to('.elemRight03b',0.5,{xPercent:-100,ease: Power2.easeOut},'three+=0.2')
.to('.elemRight03b .lineWrap',0.3,{rotation:360}, '-=0.5')

.addPause().addLabel('four')
.to('.elemTopLeft04',1,{yPercent:100,ease: Bounce.easeOut}, 'four')
.to('.elemBottomRight04',1,{yPercent:-100,ease: Bounce.easeOut}, 'four')


$(window).on("mousewheel DOMMouseScroll", onMouseWheel);

function onMouseWheel(event)
  {
    //Normalize event wheel delta
    var delta = event.originalEvent.wheelDelta / 30 || -event.originalEvent.detail;

    if(!action.isActive() && delta < -1)
    {

      action.play();
    }
    else if(!action.isActive() && delta > 1)
    {
 
      action.reverse();
    }
    event.preventDefault();
  }
!
999px

Console