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HTML

              
                <div id="app">
  SCROLL PLZ
  Lorem ipsum dolor sit amet consectetur adipisicing elit. Vitae, libero tenetur iusto placeat pariatur aliquid quos at facere magnam inventore iste laudantium qui velit eligendi aspernatur impedit voluptatibus officia expedita!
  
  Lorem, ipsum dolor sit amet consectetur adipisicing elit. Harum ducimus sed quidem magnam nemo alias exercitationem molestiae voluptatibus in, temporibus doloremque eius dignissimos excepturi adipisci quasi ex eaque deserunt rem.
  <div style="height: 5000px"></div>
  <div class="trigger-footer"></div>
  
  <footer class="footer-container">
    <div class="container">
          <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Consectetur culpa inventore labore quos officia, placeat ex blanditiis similique temporibus voluptate, explicabo ullam eos, quo magnam earum doloribus. Doloribus, ipsam ullam.</p>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Cumque veritatis sunt quisquam provident, dolores eligendi dolorum soluta beatae unde quae vero sit quod ullam earum error modi. Quaerat, ex officia?</p>
    </div>
  </footer>
</div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Signika+Negative:300,400&display=swap');

body { 
  font-family: "Signika Negative", sans-serif; 
  font-weight: 300;
  margin: 0;
  padding: 0;
  background-color: purple;
  height: 100%;
}
#app{
  display: flex;
   flex-direction: column;
}

footer {
  height: 88vh;
  background-color: red;
  overflow:hidden;
}

              
            
!

JS

              
                gsap.registerPlugin(ScrollTrigger);

// create the smooth scroller FIRST!
ScrollSmoother.create({
  content: "#app",
  smooth: 3,
  normalizeScroll: true,
  ignoreMobileResize: true,
  effects: true,
});


gsap.set(".container", { yPercent: -50 });

const uncover = gsap.timeline({ paused: true });

uncover.to(".container", { yPercent: 0, ease: "none", 
  onUpdate: function() {
    console.log("update", this.progress());
  }
});

ScrollTrigger.create({
  trigger: ".trigger-footer",
  start: "bottom bottom",
  end: "+=88%",
  animation: uncover,
  scrub: true,
  markers: false
});



ScrollTrigger.refresh();

              
            
!
999px

Console