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About the <head>

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CSS

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JavaScript

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HTML 

              
                <section class="section-1">
  <h1 class="page-title">Happy Scrolling!</h1>
  <svg class="arrow" viewBox="0 0 320 512" width="100" title="angle-double-down">
    <path d="M143 256.3L7 120.3c-9.4-9.4-9.4-24.6 0-33.9l22.6-22.6c9.4-9.4 24.6-9.4 33.9 0l96.4 96.4 96.4-96.4c9.4-9.4 24.6-9.4 33.9 0L313 86.3c9.4 9.4 9.4 24.6 0 33.9l-136 136c-9.4 9.5-24.6 9.5-34 .1zm34 192l136-136c9.4-9.4 9.4-24.6 0-33.9l-22.6-22.6c-9.4-9.4-24.6-9.4-33.9 0L160 352.1l-96.4-96.4c-9.4-9.4-24.6-9.4-33.9 0L7 278.3c-9.4 9.4-9.4 24.6 0 33.9l136 136c9.4 9.5 24.6 9.5 34 .1z" />
  </svg>
</section>
<section class="section section-2">
  <div class="curtain">
  </div>
  <div class="text">
    FROM fairest creatures we desire increase,<br>
That thereby beauty's rose might never die...
  </div>
</section>
<section class="section section-3">
  <div class="curtain">
  </div>
  <div class="text">
But as the riper should by time decease,<br>
His tender heir might bear his memory:<br>
But thou, contracted to thine own bright eyes,<br>
Feed'st thy light'st flame with self-substantial fuel,...
  </div>
</section>
<section class="section section-4">
  <div class="curtain">
  </div>
  <div class="text">
Making a famine where abundance lies,<br>
Thyself thy foe, to thy sweet self too cruel.
  </div>
</section>
!

CSS 

              
                *:before,
*:after,
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  font-family: Montserrat, sans-serif;
  font-weight: 400;
  color: #333;
}

section {
  padding: 2em;
  height: 100vh;
  border-bottom: 2px solid rgb(245, 245,66);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.section-1 {
  background-color: #6A1B9A;
  color: white;
  flex-direction: column;
}

.section-2 {
  background: yellow url(https://images.unsplash.com/photo-1592989478913-6fd5b9ed8770?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ) center center no-repeat;
  background-position: fixed;
  background-size: cover;
}

.section-3 {
  background: yellow url(https://images.unsplash.com/photo-1591942241243-7cd5619f2b95?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ) center center no-repeat;
  background-position: fixed;
  background-size: cover;
}

.section-4 {
  background: yellow url(https://images.unsplash.com/photo-1592334319415-574f0d16bc6d?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ) center center no-repeat;
  background-position: fixed;
  background-size: cover;
}

.curtain {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
}

.page-title {
  font-size: 200%;
  font-weight: 700;
  text-align: center;
}

@media(min-width: 800px) {
  .page-title {
    font-size: 300%;
  }
}

.arrow {
  fill: white;
  width: 50px;
}

.text {
  background: rgba(245, 245,66,0.7);
  padding: 1rem;
  border-radius: 10px;
  line-height: 1.5;
  box-shadow: 2px 2px 2px 2px #000000;
}

.text::first-letter {
  font-weight: bold;
  margin: 0;
  margin-right: 0.8rem;
  margin-top: -18px;
  padding: 0;
  float: left;
  font-size: 5rem;
  font-family: 'Tangerine', cursive;
  font-weight: 700;
  text-shadow: 1px 2px 1px #333333;
}
!

JS 

              
                // register ScrollTrigger only once
gsap.registerPlugin(ScrollTrigger)

// set some properties before the animation starts
gsap.set('.text', {autoAlpha: 0, scale: 0, y: 200})

// arrow animation
gsap.to('.arrow', {
  y: -5,
  repeat: -1,
  yoyo: true,
  ease: 'linear'
})

// select the elements to animate 
// on scroll
const panels = document.querySelectorAll('.curtain')
const text = document.querySelectorAll('.text')

// attach the animation to each 
// selected panel
panels.forEach((panel) => {
  gsap.to(panel, {
    scrollTrigger: {
      trigger: panel,
      start: 'top center',
      toggleActions: 'play reverse restart reverse'
    },
    bottom: '100%',
    duration: 1,
    ease: 'linear'
  })
})

// attach the animation to the text 
text.forEach((verse) => {
  gsap.to(verse, {
    autoAlpha: 1,
    scale: 1,
    y: 0,
    duration: 1.5,
    delay: 0.5,
    ease: 'circ.inOut',
    scrollTrigger: verse
  })
})
!
999px

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