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About the <head>

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Insecure Resource

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CSS

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <section id="one" class="section">
  <div class="container one">
    <header>
      <h1 class="s-heading">First Section Heading</h1>
    </header>
    <article>
      <p>Vegan yr tacos everyday carry, street art banjo cardigan four dollar toast franzen poutine wolf celiac portland keytar lo-fi. Williamsburg locavore blue bottle man bun XOXO, helvetica edison bulb.</p>
    </article>
  </div>
  <!-- .container -->
</section>
<!-- .section -->

<section id="two">
  <div class="container two">
    <header>
      <h1 class="s-heading">Second Section Heading</h1>
    </header>
    <article>
      <p>Lo-fi la croix kogi waistcoat, tousled migas yuccie selvage XOXO tote bag organic man braid umami seitan pug.  Raw denim master cleanse tacos, fap jean shorts prism tumblr authentic salvia vinyl gastropub.  Organic green juice retro chicharrones, farm-to-table ramps single-origin coffee man bun keffiyeh kickstarter lyft.  Cliche biodiesel direct trade, semiotics lumbersexual knausgaard cronut cold-pressed fanny pack yr live-edge skateboard.  Gochujang brooklyn retro, vice asymmetrical echo park pour-over.  Brooklyn gochujang trust fund hammock.  Ugh af chia, fashion axe pop-up health goth offal keytar snackwave affogato literally edison bulb paleo polaroid williamsburg.</p>
    </article>
  </div>
  <!-- .container -->
</section>
<!-- .section -->


<section id="three">
  <div class="container three">
    <header>
      <h1 class="s-heading">Third Section Heading</h1>
    </header>
    <article>
      <p>Quinoa swag four dollar toast, freegan irony authentic keffiyeh vape art party subway tile hammock ramps. Pitchfork meditation fashion axe, ethical tofu mixtape tacos fap quinoa ugh pork belly retro. Poutine drinking vinegar activated charcoal,
        tumeric occupy af cardigan ramps subway tile +1 cold-pressed authentic shabby chic.</p>
    </article>
  </div>
  <!-- .container -->
</section>
<!-- .section -->

<section id="four">
 <img src="https://c1.staticflickr.com/2/1690/24482853472_282101f633_k.jpg" class="article-bg">
  <div class="container four">
    <header>
      <h1 class="s-heading">Fourth Section Heading</h1>
    </header>
    <article>
      <p>Small batch butcher hot chicken, literally gochujang cray organic copper mug venmo disrupt subway tile bushwick lyft. </p>
    </article>
  </div>
  <!-- .container -->
</section>
<!-- .section -->
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:300,700);

$blue: #6da5ff;
$white: #f4f4f4;
html,
body {
  font-family: 'Roboto', sans-serif;
  height: 100%;
}

*,
*:after,
*:before {
  box-sizing: border-box;
}

h1 {
  padding: 20% 0 0 0;
  margin: 0;
  text-align: center;
  font-size: 50px;
  font-size:2.2em;
}

p {
  font-size:1.2em;
  line-height: 1.5;
  text-align: left;
  color: transparentize($white, .5);
}

section {
  color: white;
  position: relative;
  height: 100%;
  height: 100vh;
  
  &#one {
    background: $blue;
  }
  
  &#two {
    background: lighten($blue, 5);
    transition: all 1s;
    
    &.is-active {
      background: darken($blue, 5);
    }
  }
  
  &#three {
    background: lighten($blue, 10);
    transition: all 1s;
    
    &.is-active {
      background: darken($blue, 10);
    }
  }
  
    
  .container {
    position: relative;
    margin: 0 auto;
    max-width: 500px;
    opacity: 0;
    z-index: 9;
  }
}


section {
  &#four {
    background: white;
    transition: all 3s;
    position: relative;
    height: 100vh;
    width: 100vw;
    overflow-x: hidden;

    
    &#four img {
    position: absolute;
    top:0;
    left:50%;
    height:100%;
    max-width: none;
    transform: translateX(-50%);
    width: auto;

    z-index: 1;
    visibility: hidden;
    }

    
    &.is-active {

      color: darken($blue, 40);
      
      p {
        color: darken($blue, 10);
      }
    }
  }

}
!

JS 

              
                (function($) {
  var ctrl = new ScrollMagic.Controller({
    globalSceneOptions: {
      triggerHook: 'onLeave'
    }
  });
  
  
  // get window height
  var wh = window.innerHeight;
  
  new ScrollMagic.Scene({
  offset: wh*0
  })
  .setClassToggle("section#one", "is-active")
  .setTween( TweenMax.to(['.container.one'], 1.5, { autoAlpha: 1, ease: Power4.easeOut }))
  .addTo(ctrl);
  
  
  new ScrollMagic.Scene({
    offset: wh*0.5
  })
  .setClassToggle("section#two", "is-active")
  .setTween( TweenMax.to(['.container.two'], 1.5, { autoAlpha: 1, ease: Power4.easeOut }))
  .addTo(ctrl);
  
  
  
  new ScrollMagic.Scene({
    offset: wh*1.75
  })
  .setClassToggle("section#three", "is-active")
  .setTween( TweenMax.to(['.container.three'], 1.5, { autoAlpha: 1, ease: Power4.easeOut }))
  .addTo(ctrl);
  
  
  
    new ScrollMagic.Scene({
    offset: wh*2.75
  })
  .setClassToggle("section#four", "is-active")
  .setTween(new TimelineMax().add([
      TweenMax.to("section#four img", 1.5, {force3D: true, ease: Linear.easeInOut, autoAlpha: 1}),
      TweenMax.fromTo(['.container.four'], 4.5, {autoAlpha:0}, {autoAlpha:1, ease: Power4.easeOut})
    ]))
  .addTo(ctrl);
 
})(jQuery);
!
999px

Console