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HTML 

              
                <header id="site-header">
    <div class="header-container">
        <div class="header-logo | animate-scroll-fade-in" data-delay="0.25" data-duration="1.5">
            <a href="/">
              <svg viewBox="0 0 138 26" fill="none" stroke="greenyellow" stroke-width="2.3" stroke-linecap="round" stroke-linejoin="round" title="CodePen"><path d="M15 8a7 7 0 100 10m7-8.7L33 2l11 7.3v7.4L33 24l-11-7.3zm0 0l11 7.4 11-7.4m0 7.4L33 9.3l-11 7.4M33 2v7.3m0 7.4V24M52 6h5a7 7 0 010 14h-5zm28 0h-9v14h9m-9-7h6m11 1h6a4 4 0 000-8h-6v14m26-14h-9v14h9m-9-7h6m11 7V6l11 14V6"></path></svg>
            </a>
        </div>

        <div class="header-nav | animate-scroll-fade-in" data-delay="0.5" data-duration="1.5">
            <nav class="nav-traditional" aria-label="Navigation Menu">
                <ul>
                    <li class="nav-item standard"><a href="/" class="nav-link">About</a></li>
                    <li class="nav-item standard"><a href="/" class="nav-link">Services</a></li>
                    <li class="nav-item standard"><a href="/" class="nav-link">Portfolio</a></li>
                    <li class="nav-item standard"><a href="/" class="nav-link">Blog</a></li>
                    <li class="nav-item standard"><a href="/" class="nav-link">Contact</a></li>
                </ul>
            </nav>
        </div>
    </div>
</header>

<section id="site-masthead" role="complementary" aria-label="Photo Slideshow" class="animate-scroll-fade-in" data-delay="0" data-duration="1.5">
    <div class="masthead-slideshow">
        <div class="masthead-content | animate-scroll-fade-in" data-delay="0.75" data-duration="1.5">
            <div class="masthead-content-container">
                <h1>Building Cool Things Since 1988</h1>
            </div>
        </div>

        <div class="glide">
            <img src="https://images.unsplash.com/photo-1635170870336-67546b863d13" alt="">
        </div>
    </div>
</section>

<main>
    <section class="content content-split">
        <div class="content-split-item content-split-text | animate-scroll-slide-horizontal" data-delay="0.25" data-trigger="100px" data-scroller="95%" data-position="-100">
            <h2>Site Content</h2>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Distinctio mollitia nostrum, praesentium provident officia odit possimus commodi blanditiis fugiat animi recusandae, necessitatibus assumenda cumque vel, molestias quo.</p>
          <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Distinctio mollitia nostrum, praesentium provident officia odit possimus commodi blanditiis fugiat animi recusandae, necessitatibus assumenda cumque vel, molestias quo.</p>
        </div>

        <div class="content-split-item content-split-image | animate-scroll-slide-horizontal" data-delay="0.25" data-trigger="100px" data-scroller="95%" data-position="100">
            <img src="https://images.unsplash.com/photo-1542324253097-09d465f007bc" alt="">
        </div>
    </section>
  
  <section class="content content-small | animate-children-scroll-fade-in" data-scroller="95%"  data-delay="0.25">
    <div class="content-item">
      <h2>This is a heading 1</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Eligendi ipsam architecto natus dolor eius voluptatem similique quod corporis quaerat, quos magnam voluptatibus sequi illo rem porro expedita voluptatum. Repellat, voluptatem.</p>
    </div>
    
    <div class="content-item">
      <h2>This is a heading 2</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Eligendi ipsam architecto natus dolor eius voluptatem similique quod corporis quaerat, quos magnam voluptatibus sequi illo rem porro expedita voluptatum. Repellat, voluptatem.</p>
    </div>
    
    <div class="content-item">
      <h2>This is a heading 3</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Eligendi ipsam architecto natus dolor eius voluptatem similique quod corporis quaerat, quos magnam voluptatibus sequi illo rem porro expedita voluptatum. Repellat, voluptatem.</p>
    </div>
    
    <div class="content-item">
      <h2>This is a heading 4</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Eligendi ipsam architecto natus dolor eius voluptatem similique quod corporis quaerat, quos magnam voluptatibus sequi illo rem porro expedita voluptatum. Repellat, voluptatem.</p>
    </div>
  </section>
</main>
!

CSS 

              
                body {
  margin: 0;
  background-color: #000;
  color: #fff;
  font-family: 'Monterrat', sans-serif;
}

h1,
h2 {
  margin: 0 0 0.5em 0;
  line-height: 1;
}

h1 {
  font-size: 3rem;
  
  @media (max-width: 1300px) {
    font-size: 2rem;
  }
}

h2 {
  font-size: 2.5rem;
}

p {
  margin: 0 0 1em 0;
  font-size: 1.5rem;
  line-height: 1.75;
}

.text-center {
  text-align: center;
}




// **************************************************
//  Header
// **************************************************
header#site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 10000;
  background-color: #323233;
}




// **************************************************
//  Header Container
// **************************************************
.header-container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: 2em;
  max-width: 1920px;
  margin-inline: auto;
  padding-block: 2.25em;
  padding-inline: 1em;

  @media (max-width: 1360px) {
    flex-direction: column;
    gap: 0;
    padding-block: 1em;
  }
}




// **************************************************
//  Header Logo
// **************************************************
.header-logo {
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;

  a {
    width: 420px;
    
    @media (max-width: 1360px) {
      width: 210px;
    }
  }

  img {
    display: block;
  }
}




// **************************************************
//  Header Nav
// **************************************************
.header-nav {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

.nav-traditional {
  margin: 0;
  padding: 0;
  opacity: 1;
  display: block;

  >ul {
    display: flex;
    gap: 0.25em;
    margin: 0;
    padding: 0;
    list-style: none;
    
    @media(max-width: 540px) {
      gap: 0;
    }

    >li {
      position: relative;

      >a {
        display: block;
        padding-block: 0.6em;
        padding-inline: 1.2em;
        color: #fff;
        font-size: 1.4rem;
        font-family: 'Montserrat', sans-serif;
        line-height: 1;
        font-weight: 400;
        text-decoration: none;
        
        @media (max-width: 1360px) {
          font-size: 1rem;
        }
        
        @media(max-width: 540px) {
          padding-inline: 0.75em
        }
      }

      &.standard {
        >a {
          transition: all 0.5s;

          &:hover,
          &:focus{
            background-color: #5A5F73;
            color: #fff;
          }
        }
      }
    }
  }
}




// **************************************************
//  Masthead Slideshow
// **************************************************
#site-masthead {
  position: relative;
  background-color: #000;
}

.masthead-slideshow {
  .glide {
    max-height: 960px;
  }

  img {
    display: block;
    object-fit: cover;
    width: 100%;
    height: 100%;
    max-width: none;
  }
}

.masthead-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding-inline: 1em;
  z-index: 101;
  color: #fff;
  
  h1 {
    margin: 0 0 0.25em 0;
    text-align: center;
  }
} 




// **************************************************
//  Main
// **************************************************
main {
  padding-block: 5em;
  padding-inline: 1em;
}




// **************************************************
//  Content
// **************************************************
.content {
  max-width: 1920px;
  margin-inline: auto;
  padding-block: 2.25em;
  padding-inline: 1em;
  
  &.content-small {
    max-width: 1300px;
  }
}

.content-item {
  margin-bottom: 5em;
}

.content-split {
  display: flex;
}

.content-split-item {
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: 50%;
}

.content-split-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.content-split-image {
  min-width: 0;

  img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 600px;
    object-fit: cover;
  }
}
!

JS 

              
                // Created by Alex Winter
// Created: 2022-07-25
// Modified: 2022-11-28




// **************************************************
// Masthead Slideshow Height
// **************************************************
const header = document.querySelector('#site-header');
const masthead = document.querySelector('.masthead-slideshow .glide');

// ternary operator
// if the element is null (undefined and doesnt exist in DOM) then set its offsetHeight value to 0
const headerHeight = header != null ? header.offsetHeight : 0; // get header height

// define viewport height
let viewportHeight = window.innerHeight;

const setMastheadHeight = () => {
    // calculate masthead height
    let mastheadHeight = viewportHeight - headerHeight;

    // apply masthead height value to masthead element
    if (masthead) {
        masthead.style.height = mastheadHeight  + 'px';
    };
};
setMastheadHeight();




// **************************************************
//  GSAP Animations
// **************************************************
// Register the ScrollTrigger plug-in
gsap.registerPlugin(ScrollTrigger)




// **************************************************
//  GSAP - Scroll - Refresh All ScrollTriggers 
// **************************************************
// * Call this function within your scrollTrigger timeline to recalculate the positioning of all of the ScrollTriggers on the page.
// * This is useful on for the "Site Header" for example because it is a fixed element that changes height after scrolling down below the fold, which breaks the placement of all other ScrollTriggers on the page.
// * This will fire after X miliseconds, hopefully after the animations have finished. Change the amount of time as needed.
const refreshScrollTrigger = () => {
    setTimeout(() => {
        ScrollTrigger.refresh() // https://greensock.com/docs/v3/Plugins/ScrollTrigger/static.refresh()
        // console.log('setTimeout has elapsed')
    }, 2000)
    // console.log('toggled inactive or active')
}




// **************************************************
//  GSAP - Scroll - Fade In (Selected element's children)
// **************************************************
// Class:       animate-children-scroll-fade-in
// Description: This appends the 'animate-fade-in-scroll' class and its data attributes to all respective child elements
// data-delay    = number (float)      - default is 0
// data-duration = number (float)      - default is 1
// data-trigger  = top, center, bottom - default is top
// data-scroller = top, center, bottom - default is bottom
// data-markers  = false, true         - default is false
let animateChildrenScrollFadeIn = document.querySelectorAll('.animate-children-scroll-fade-in')
animateChildrenScrollFadeIn.forEach((element) => {
    element.querySelectorAll(':scope > *').forEach((childElement) => {
        childElement.classList.add('animate-scroll-fade-in')

        if (element.dataset.delay) {
            childElement.dataset.delay = parseFloat(element.dataset.delay)
        }

        if (element.dataset.duration) {
            childElement.dataset.duration = parseFloat(element.dataset.duration)
        }

        if (element.dataset.trigger) {
            childElement.dataset.trigger = element.dataset.trigger
        }

        if (element.dataset.scroller) {
            childElement.dataset.scroller = element.dataset.scroller
        }

        if (element.dataset.markers) {
            childElement.dataset.markers = element.dataset.markers
        }
    })
})



// **************************************************
//  GSAP - Scroll - Fade In (Selected element only)
// **************************************************
// Class:       animate-scroll-fade-in
// Description: Fade in from opacity 0
// data-delay    = number (float)      - default is 0
// data-duration = number (float)      - default is 1
// data-trigger  = top, center, bottom - default is top
// data-scroller = top, center, bottom - default is bottom
// data-markers  = false, true         - default is false
let animateScrollFadeIn = gsap.utils.toArray('.animate-scroll-fade-in')
animateScrollFadeIn.forEach((element) => {
    let dataDelay = 0;
    if (element.dataset.delay) {
        dataDelay = parseFloat(element.dataset.delay)
    }

    let dataDuration = 1;
    if (element.dataset.duration) {
        dataDuration = parseFloat(element.dataset.duration)
    }

    let dataTrigger = 'top'
    if (element.dataset.trigger) {
        dataTrigger = element.dataset.trigger
    }

    let dataScroller = 'bottom'
    if (element.dataset.scroller) {
        dataScroller = element.dataset.scroller
    }

    let dataMarkers = false
    if (element.dataset.markers) {
        dataMarkers = element.dataset.markers
    }

    let timeline = gsap.timeline({
        scrollTrigger: {
            trigger: element,
            start: dataTrigger + " " + dataScroller,
            markers: dataMarkers,
            toggleActions: "play none none none",
            toggleClass: "scrolled"
        }
    })

    timeline.from(element, {
        opacity: 0,
        delay: dataDelay,
        duration: dataDuration
    })
})




// **************************************************
//  GSAP - Scroll - Slide Horizontal
// **************************************************
// Class:       animate-scroll-slide-horizontal
// Description: Slide in from left or right
// data-delay    = number (float)      - default is 0
// data-duration = number (float)      - default is 1
// data-trigger  = top, center, bottom - default is top
// data-scroller = top, center, bottom - default is bottom
// data-markers  = false, true         - default is false
// data-position = px, em, %, vh, etc  - default is "100px"
let animateScrollSlideHorizontal = gsap.utils.toArray('.animate-scroll-slide-horizontal')
animateScrollSlideHorizontal.forEach((element) => {
    let dataDelay = 0;
    if (element.dataset.delay) {
        dataDelay = parseFloat(element.dataset.delay)
    }

    let dataDuration = 1;
    if (element.dataset.duration) {
        dataDuration = parseFloat(element.dataset.duration)
    }

    let dataTrigger = 'top'
    if (element.dataset.trigger) {
        dataTrigger = element.dataset.trigger
    }

    let dataScroller = 'bottom'
    if (element.dataset.scroller) {
        dataScroller = element.dataset.scroller
    }

    let dataMarkers = false
    if (element.dataset.markers) {
        dataMarkers = element.dataset.markers
    }

    let dataPosition = "100px";
    if (element.dataset.position) {
        dataPosition = element.dataset.position
    }

    let timeline = gsap.timeline({
        scrollTrigger: {
            trigger: element,
            start: dataTrigger + " " + dataScroller,
            markers: dataMarkers,
            toggleActions: "play none none none",
            toggleClass: "scrolled"
        }
    })

    timeline.from(element, {
        x: dataPosition,
        opacity: 0,
        delay: dataDelay,
        duration: dataDuration
    })
})




// **************************************************
//  GSAP - Scroll - Slide Vertical
// **************************************************
// Class:       animate-scroll-slide-vertical
// Description: Slide in from top or bottom
// data-delay    = number (float)      - default is 0
// data-duration = number (float)      - default is 1
// data-trigger  = top, center, bottom - default is top
// data-scroller = top, center, bottom - default is bottom
// data-markers  = false, true         - default is false
// data-position = px, em, %, vh, etc  - default is "100px"
let animateScrollSlideVertical = gsap.utils.toArray('.animate-scroll-slide-vertical')
animateScrollSlideVertical.forEach((element) => {
    let dataDelay = 0;
    if (element.dataset.delay) {
        dataDelay = parseFloat(element.dataset.delay)
    }

    let dataDuration = 1;
    if (element.dataset.duration) {
        dataDuration = parseFloat(element.dataset.duration)
    }

    let dataTrigger = 'top'
    if (element.dataset.trigger) {
        dataTrigger = element.dataset.trigger
    }

    let dataScroller = 'bottom'
    if (element.dataset.scroller) {
        dataScroller = element.dataset.scroller
    }

    let dataMarkers = false
    if (element.dataset.markers) {
        dataMarkers = element.dataset.markers
    }

    let dataPosition = "100px";
    if (element.dataset.position) {
        dataPosition = element.dataset.position
    }

    let timeline = gsap.timeline({
        scrollTrigger: {
            trigger: element,
            start: dataTrigger + " " + dataScroller,
            markers: dataMarkers,
            toggleActions: "play none none none"
        }
    })

    timeline.from(element, {
        y: dataPosition,
        opacity: 0,
        delay: dataDelay,
        duration: dataDuration
    })
})




// **************************************************
//  GSAP - Scroll - Site Header
// **************************************************
const headerContainer = document.querySelector('#site-header .header-container')
const headerLogo = document.querySelector('.header-logo a')
ScrollTrigger.matchMedia({
    "(min-width: 540px) and (max-height: 1100px)": function() {
        const timeline = gsap.timeline({
            scrollTrigger: {
                trigger: 'main',
                start: "top 90%",
                toggleActions: "play none none reverse",
                onToggle: self => refreshScrollTrigger(),
                // markers: true,
            }
        });
        timeline.to(headerContainer, { paddingBlock: '20px' })
        .to(headerLogo, { width: '320px' }, '<')
    }
})
!
999px

Console