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HTML

            
              <header class="js-header header">
  <div class="header__content">Header</div>
  <div class="js-header-bg header__bg"></div>
</header>
<section class="js-page page">
  Section 1
</section>
<section class="js-page page">
  Section 2
</section>
<section class="js-page page">
  Section 3
</section>
<section class="js-page page">
  Section 4
</section>
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CSS

            
              * {
  box-sizing: border-box;
}
.header {
  background-color: black;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  color: white;
  padding: 12px 0;
  text-align: center;
  box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.1);
  &__content {
    z-index: 99;
  }
  &__bg {
    background-color: fuchsia;
    height: 0;
    width: 100%;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
  }
}
.page {
  text-align: center;
  padding: 48px 0 6px;
  height: 100vh;
  background-color: cornflowerblue;
  &:nth-of-type(4n+2) {
    background-color: goldenrod;
  }
  &:nth-of-type(4n+3) {
    background-color: aquamarine;
  }
  &:nth-of-type(4n+4) {
    background-color: mediumvioletred;
  }
}
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JS

            
              // jquery
// greensock
// scrollmagic

$(document).ready(function() {

	// scrollmagic page transitions
	var $pages = $('.js-page');
	var $header = $('.js-header');
	var $headerBg = $('.js-header-bg');
	var headerHeight = $header.outerHeight();

	var controller = new ScrollMagic.Controller();

  $pages.each(function(i, item) {    
		var tweenHeaderColor = new TimelineMax()
			.set('.js-header-bg', {
				'background-color': $(item).css('background-color')
			})
      .call(function() { console.log($(item).css('background-color')); debugger; }) 
			.to('.js-header-bg', 0.4, {
				'height': headerHeight
			})
      .set('.js-header', {
				'background-color': $(item).css('background-color')
			})
			.set('.js-header-bg', {
				'height': 0
			});

		var transitionPages = new ScrollMagic.Scene({
			reverse: true,
			triggerElement: item,
			triggerHook: 0,
			offset: -headerHeight
		})
		.setTween(tweenHeaderColor)
		.addIndicators()
		.addTo(controller);
	});

});
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