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HTML

              
                <main>
  <div id="intro">
    <div id="banner" style="background-image:url('https://i.imgur.com/S3qLyik.jpg');">
      <p>Page loads with a 70% height banner, and a lower header portion at 30% height, with the h1 vertically aligned in the middle.</p>
      <p>As the page scrolls, the banner should be position fixed (pinned) and reduce to 50% height, at which point it unpins.</p>
    </div>
    <div id="main-title">
      <h1 id="header_title" class="cinzel light">30% HEIGHT HEADER, VERTICALLY ALIGNED IN THE MIDDLE. SCROLLING UP ABOVE THE BANNER, AND FADING TO 0 OPACITY.</h1>
      <div id="reveal">
        <img id="piano" src="https://i.imgur.com/4ciexs6.png" />
        <h1 id="subheader_title" class="cinzel">SUB-HEADER</h1>
        <p id="intro" class="gothic">Once the banner has reduced to 50% window height, the page should continue scrolling normally.</p>
      </div>
    </div>
  </div>
</main>
              
            
!

CSS

              
                html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: arial;
  background-size: cover;
  background-position: center center;
  background-attachment: fixed;
}

.cinzel.light {
  font-weight: 400;
}

.gothic {
  font-family: "alternate-gothic-no-2-d";
}

h1 {
  font-size: 30px;
  margin: 0;
}

main {
  text-align: center;
  color: #000;
}

#banner {
  position: relative;
  display: block;
  float: left;
  width: 100%;
  background-position: center center;
  background-size: contain;
  z-index: 1;
}

#main-title {
  position: relative;
  display: block;
  float: left;
  width: 100%;
  z-index: 1;
}
              
            
!

JS

              
                $(document).ready(function() {

  set_heights();

  overall_h = $('#main-title').height();
  console.log(overall_h);

  var mainWrapper = document.getElementsByTagName('main')[0],
    banner = document.getElementById('banner'),

    // set the duration in pixels
    duration = wh + $('#main-title').height(),

    // define the main controller for ScrollMagic
    // (we can have multiple controllers if needed)
    controller = new ScrollMagic.Controller({
      loglevel: 0,
      globalSceneOptions: {
        // set trigger hook to top of viewport
        triggerHook: 0
      }
    });

  // start a new ScrollMagic scene by calling the
  // provided method from the ScrollMagic Class
  var bannerScene = new ScrollMagic.Scene({
    triggerElement: mainWrapper,
    duration: lower_height
  })

  // start our tween/animation
  bannerScene.setTween(new TimelineMax().add([
    TweenMax.to(banner, 1, {
      height: wh/2
    }),
    TweenMax.to('h1#header_title', 1, {
      opacity: 1,
      y: -100
    }),
  ]))

  // set hero block fixed for duration of wrapper
  bannerScene.setPin('#banner', {
    pushFollowers: false
  })

  // add helpful indicators to help with setting up animations right
  bannerScene.addIndicators()

  // finally, we add the animation to the
  // main controller we defined in the beginning
  bannerScene.addTo(controller);

  bannerScene.on("end", function(event) {
    console.log("End banner scene");
  });

  // start a new ScrollMagic scene by calling the
  // provided method from the ScrollMagic Class
  var revealScene = new ScrollMagic.Scene({
    triggerElement: mainWrapper,
    duration: upper_height
  })

  // start our tween/animation
  revealScene.setTween(new TimelineMax().add([
    TweenMax.to('#reveal', 1, {
      opacity: 1,
      y: -100
    }),
  ]))

  // add helpful indicators to help with setting up animations right
  revealScene.addIndicators()

  // finally, we add the animation to the
  // main controller we defined in the beginning
  revealScene.addTo(controller);

  revealScene.on("end", function(event) {
    console.log("End reveal scene");
  });

});

$(window).resize(function() {
  set_heights();
});

function set_heights() {
  wh = window.innerHeight;
  upper_height = 70 * wh / 100;
  lower_height = 30 * wh / 100;
  h1_pad = lower_height / 2 - $('h1#header_title').height() / 2;
  $('h1#header_title').css('padding-top', h1_pad + 'px');
  $('h1#header_title').css('padding-bottom', h1_pad + 'px');
  $('#banner').css('height', upper_height + 'px');
}
              
            
!
999px

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