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HTML 

              
                <div class="wrapper">
  <nav>
    <div class="container">
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
        <a class="navbar-brand" href="#"><i class="fa fa-codepen"></i></a>
        <p class="navbar-text navbar-right">Made with <strong>ES6</strong></p>
      </div>
    </div>
  </nav>
  <section class="hero vertical-center">
    <div class="container text-center">
      <h1>Easy Rainbow Parallax</h1>
    </div>
    <div class="optional-rainbow"></div>
  </section>
  <section class="content">
    <div class="container">
      <article>
        <div class="col-sm-6 article-left">
          <img src="https://dl.dropbox.com/s/zugi03ayjbjc7or/coffeePour_sm.jpg?dl=1" alt="mmmm" class="article-image" style="max-width:100%;">
        </div>
        <div class="col-sm-6 article-right">
          <h2>EASY-PEASY</h2>
          <p>It's just a colored pseudo-element. ES6 Parallax scrolling/zooming just for fun.</p>
          <p>For added fun, toggle the version with increasing rainbow opacity!</p>
          <div class="control row">
            <div class="col-xs-8">Rainbopacity: </div>
            <div class="col-xs-3">
              <div class="selectable" class="off"></div>
            </div>
          </div>
        </div>
      </article>
    </div>
  </section>
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Work+Sans:400,300,200,700);

html,body{
  display:block;
  width:100%;
  height:100%;
}
h1, h2, p {
  font-family:"Work Sans", serif;
}

.wrapper{ display:block; height:auto; position:relative; padding-bottom:3em;}

//THE IMPORTANT BIT

.hero{
  position:relative;
  height:100%;
  width:100%;
  background:url(https://dl.dropbox.com/s/9u786zwyehzuvam/cliffSide_mini.jpg?dl=1) no-repeat 50% 50% fixed;
  background-size:200%;
  overflow:hidden;
  
  h1{
    position:relative;
    z-index:50;
    color:white;
    font-size:80px;
    font-weight:200;
  }
  
  &.fadeout{
    .optional-rainbow{
      display:block;
    }
    &:before{
    display:none;
    }
  }
  
  &:before{
    display:block;
    position:absolute;
    height:100%;
    width:100%;
    z-index:5;
    content:"";
    background:-webkit-linear-gradient(#30f89c, #352ce6, #fc5e9d); 
    background: -moz-linear-gradient(left, #30f89c, #352ce6, #fc5e9d); 
    background:linear-gradient(#30f89c, #352ce6, #fc5e9d); 
    opacity:0.4;
  }
  
  &:after{
    display:block;
    position:absolute;
    bottom:0;
    left:0;
    content:"";
    width:100%;
    height:6px; 
    background: -webkit-linear-gradient(left, #30f89c, #352ce6, #fc5e9d); 
    background: -moz-linear-gradient(left, #30f89c, #352ce6, #fc5e9d); 
    background: linear-gradient(left, #30f89c, #352ce6, #fc5e9d);
    
  }
  
  .optional-rainbow{
    display:none;
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background: -webkit-linear-gradient(#30f89c, #352ce6, #fc5e9d); 
    background: -moz-linear-gradient(#30f89c, #352ce6, #fc5e9d); 
    background: linear-gradient(#30f89c, #352ce6, #fc5e9d);
    opacity:0.4;
    z-index:4;
  }
  
}


//SUPERFLUOUS STYLEY STUFF

nav {
  position:absolute;
  top:0;
  z-index:20;
  width:100%;
  color:white;
  
  >.container{
    position:relative;
  }
  
  .navbar-brand{
    color:white;
    font-size:26px;
  }
  .navbar-right{
    margin-right:1em;
    position:absolute;
    right:0;
  }
  
  > div{
    border-bottom:1px solid rgba(255,255,255,0.4);
  }
}

article{
  padding:3em 0;
  color:#545454;
  font-size:18px;
  
  .article-right{
    max-width:400px;
    margin:0 auto;
  }
  
  @media(max-width:767px){
    text-align:center;
    img{
      margin-bottom:2em;
    }
  }
   
  p{
    margin:2em 0;
  }
  
  h2{
    font-size:54px;
    font-weight:200;
    margin-top:0;
    text-transform:uppercase;
  }
  
  img{
    border:3px solid #e6e6e6;
  }
}

.control{
  width:100%;
  padding:0.5em 1em;
  background:#e6e6e6;
  border-radius:10px;
}

//control
.selectable{
  display:block;
  position:relative;
  width:40px;
  height:20px;
  background:rgba(255,44,44,0.6);
  border-radius:10px;
  box-shadow:inset 0 1px 2px rgba(0,0,0,0.2);
  transition:all .2s linear;
  
  &:before{
    display:block;
    position:absolute;
    content:"";
    width:20px;
    height:20px;
    border-radius:50%;
    background:white;
    box-shadow:0 2px 1px rgba(0,0,0,0.2);
    top:0;
    left:0;
    transition:all .2s linear;
  }
  
  &.on {
    background:rgba(44,255,44,0.5);
    
    &:before{
      left:calc(100% - 20px);
    }
  }
}

.vertical-center{
	min-height: 100%;  /* Fallback for browsers do NOT support vh unit */
  min-height: 100vh; /* These two lines are counted as one :-)       */

  display: flex;
  align-items: center;
}
!

JS 

              
                window.onload=()=>{
  const ph = new ParallaxHero('.hero')
}

class ParallaxHero{
  constructor(q){
    this.element = q;
    this.bindScroll();
    this.sampleScroll();
  }
  bindScroll(){
    $(window).on('scroll', ()=>{
      const scrolled = $(window).scrollTop();
      //Move & fade the H1 on scroll.
      $(`${this.element} h1`).css({
        'top':`${scrolled * 0.7}px`,
        'opacity':`${1-(scrolled/$(this.element).outerHeight())*1.8}` 
      });
      //Move & zoom the hero background image
      $(this.element).css({
        'background-position':`50% calc(50% + ${scrolled * 0.2}px)`,
        'background-size': `${200 + (scrolled*50/$(this.element).outerHeight())}%`
      });
      //Fade the extra rainbow div just in case it's visible
      $(`${this.element} .optional-rainbow`).css('opacity', `${0.4 + (scrolled/$(this.element).outerHeight())}`);
    });  
    //added control to toggle the extra rainbow div, just for s&g
    $('.selectable').on('click', (e)=>{
      $('.selectable').toggleClass('on');
      $('.hero').toggleClass('fadeout');
    });
  }
  sampleScroll(){
    //move it so that it shows in portfolio
    setTimeout(function(){$.scrollTo(500, 2000)}, 500)
  }
  
}
!
999px

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