class ScrollControl {
  constructor() {
    this.sectionDOMList = document.querySelectorAll('section');
    this.initListeners();
  }

  initListeners() {
    window.addEventListener('scroll', (e) => {
      this.animateSections();
    });
  }

  animateSections() {
    for (let i = 0; i < this.sectionDOMList.length; i++) {
      if (this.isInViewport(this.sectionDOMList[i])) {
      	if(!this.sectionDOMList[i].isReveal){
          this.sectionDOMList[i].isReveal = true;
          this.sectionDOMList[i].classList.add('reveal');
        }
      }
    }
  }

  isInViewport(element) {
    const elementCenter = (element.getBoundingClientRect().top + element.getBoundingClientRect().bottom)/2;
    const viewportTop = window.scrollY;
    const viewportBottom = viewportTop + window.innerHeight;
    return elementCenter < viewportBottom;
  }
}

(function() {
  new ScrollControl();
})();

/* Reset */

html {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

*,
*:before,
*:after {
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
ol,
ul {
  margin: 0;
  padding: 0;
  font-weight: normal;
}

ol,
ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* Base */

body {
  width: 100%;
  height: 100%;
  background: white;
  color: #3b3b3b;
  font-family: 'Larsseit', Helvetica, Arial, sans-serif;
}

.container {
  max-width: 1640px;
  margin-left: 30px;
  margin-right: 30px;
}

@media (min-width: 768px) {
  .container {
    margin-left: 80px;
    margin-right: 80px;
  }
}

@media (min-width: 1800px) {
  .container {
    margin: 0 auto;
  }
}

.vc {
  display: table;
  height: 100%;
}

.vc-ele {
  display: table-cell;
  vertical-align: middle;
}

section {
  padding: 400px 0;
}

section.full-vh {
  position: relative;
  width: 100%;
  height: 100vh;
  padding: 0;
}

.row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

.col-half {
  width: 100%;
}

@media (min-width: 992px) {
  .col-half {
    width: 50%;
  }
}

.row.align-center {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

/* Typography */

h1 {
  font-size: 52px;
}

h2 {
  font-size: 26px;
}

p {
  font-family: 'Larsseit', Helvetica, Arial, sans-serif;
  font-size: 16px;
  font-weight: 300;
  line-height: 1.5;
  color: #3b3b3b;
}

/* Image reveal */

.image-reveal {
  position: relative;
  overflow: hidden;
}

.image-reveal-cover {
  background: #fcfcfc;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 5;
  transform: translateX(0);
  -webkit-transform: translateX(0);
  transition: transform cubic-bezier(.19, 1, .22, 1) 1.75s;
  -webkit-transition: transform cubic-bezier(.19, 1, .22, 1) 1.75s;
}

.image-reveal img {
  position: relative;
  z-index: 2;
  opacity: 0;
  transform: scale(1.4);
  -webkit-transform: scale(1.4);
  transition: all cubic-bezier(.19, 1, .22, 1) 1.5s;
  -webkit-transition: all cubic-bezier(.19, 1, .22, 1) 1.5s;
}

section.reveal .image-reveal-cover {
  transform: translateX(100%);
  -webkit-transform: translateX(100%);
}

section.reveal .image-reveal img {
  opacity: 1;
  transform: scale(1);
  -webkit-transform: scale(1);
}

  


    

      

        

          
Scroll down
        
      
    

    

      


        

          

            

            
          
        

        

          
This is my horse.
          
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            quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.
          
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            ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?