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CSS

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JavaScript

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HTML 

              
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<div class="container"> 
  <h1>Lets Have Some Fun With Scrolling</h1>
  <div class="content-diagonal">
    <div class="content-block">
      <img src="https://placebear.com/400/400" alt="" />
      <p>We're going to scroll diagonally!</p>
    </div>
    <div class="content-block">
      <img src="https://placebear.com/500/500" alt="" />
      <p>Isn't this neat?</p>
    </div>
    <div class="content-block">
      <img src="https://placebear.com/600/600" alt="" />
      <p>Check out the css & js to see how it's acheived</p>
    </div>
    <div class="content-block">
      <img src="https://placebear.com/300/300" alt="" />
      <p>Wow, that's a lot of bears</p>
    </div>
    <div class="content-block">
      <img src="https://placebear.com/450/450" alt="" />
      <p>When does this thing end?</p>
    </div>
    <div class="content-block">
      <img src="https://placebear.com/500/500" alt="" />
      <p>OK, last one!</p>
    </div>
  </div>  
</div>
<footer>
  <div class="container">
    <p>Thanks for checking out the demo!</p>
    <p><a href="http://jacobharris.codes">jacobharris.codes</a></p>
    <a href="https://codepen.io/ahoy/" target="_blank" class="codepen">
      <svg class="logo">
        <use xlink:href="#codepen-logo"></use>
      </svg>
      &nbsp;ahoy
    </a>
  </div>
</footer>
!

CSS 

              
                $spacer: 400px;

*{
  box-sizing: border-box;
}

body{
  background-color: #ffffff;
  background-image: url(http://jacobharris.codes/media/vsRawcK.jpg);
  background-attachment: fixed;
  background-size: cover;
  background-position: 50% -50%;
  overflow-x: hidden;
}

h1 {
  background-color: #e81c1d;
  padding:30px 30px;
  color: #ffffff;
}

p {
  // color: #e81c1d;
  color: #333;
  font-size: 24px;
  margin: 0;
  padding: 0 0px 15px 15px;
}

.container{
  max-width: 100%;
  width: 960px;
  padding: 45px 15px $spacer;
  margin: 0 auto;
  border-left: 5px solid #e81c1d;
  
  @media (min-width: 1200px){
    width: 1230px;
  }
}

.content-diagonal{
  padding-left: $spacer / 2;
  margin-top: $spacer / 4;
}
.content-block{
  width: $spacer * 2;
  height: $spacer;
  position: relative;
  display: flex;
  align-items: center;
  &:nth-child(2){
    margin-left: $spacer;
  }
  &:nth-child(3){
    margin-left: $spacer * 2;
  }
  &:nth-child(4){
    margin-left: $spacer * 3;
  }
  &:nth-child(5){
    margin-left: $spacer * 4;
  }
  &:nth-child(6){
    margin-left: $spacer * 5;
  }
  img {
    width: 400px;
    clip-path: circle(50% at 50% 50%);
  }
}

footer {
  background: #fceeed;
  padding: 0px 0;
  height: 100vh;
  display:flex;
  align-items: stretch;
  position: relative;
  p{
    padding: 100px 0;
  }

  a {
    color: #333;
    text-decoration: none;
    font-size: 24px;
    display:flex;
    align-items: center;
    
     svg{
      width:50px;
    }
  }
}
!

JS 

              
                const container = document.querySelector('.content-diagonal');
const contentHeight = container.offsetHeight;
const numBlocks = container.querySelectorAll('.content-block').length;

window.addEventListener('scroll', function(){
  let haveScrolled = window.pageYOffset;
  let proportion = (haveScrolled / contentHeight);
  const toMove = "-" + (proportion * contentHeight) + "px";
  container.style.transform = "translateX("  + toMove + ")" ;
});
!
999px

Console