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HTML

CSS

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JavaScript

Babel includes JSX processing.

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HTML

              
                  <section class="hero-section" id="js-hero">
    <img src="https://source.unsplash.com/uN1m9Ca0aqo"
    alt="Photo by Tamara Bellis on Unsplash" />
  </section>
  <section class="container">
    <h1>Summer In Winter</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
    tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
    veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
    commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
    velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
    cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id
    est laborum.</p>

    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
    tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
    veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
    commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
    velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
    cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id
    est laborum.</p>
  </section>

  <!-- JavaScript & jQuery -->
<script src="https://code.jquery.com/jquery-3.3.1.js"
          integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="
          crossorigin="anonymous">
</script>
<script src="js/index.js"></script>
              
            
!

CSS

              
                html {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 62.5%;
}

body {
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 6.5rem;
  color: #f39c12;
  text-align: center;
  font-weight: 300;
}

p {
  font-size: 1.8rem;
  color: #777;
  margin: 2rem 0;
  line-height: 2.5rem;
}

p:first-child {
  margin-top: 0;
}

.container {
  width: 75%;
  margin: 0 auto;
}

.hero-section {
  width: 100%;
  height: 70rem;
  overflow: hidden;
  position: relative;
}

.hero-section img {
  width: 100%;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%);
}

              
            
!

JS

              
                $(window).scroll(function() {
  var scroll = $(window).scrollTop();
  $("#js-hero img").css({
    width: (100 + scroll/5) + "%"
  })
})

              
            
!
999px

Console