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HTML 

              
                <div id="page" class="site">

  <div id="feather" class="feather"></div>

  <header id="masthead" class="site-header" role="banner">
    <nav class="anchor-nav" role="navigation">
      <a href="#intro" class="anchor">Home</a>
      <a href="#panel-1" class="anchor">Panel 1</a>
      <a href="#panel-3" class="anchor">Panel 3</a>
      <a href="#panel-5" class="anchor">Panel 5</a>
      <a href="#map" class="anchor">Map</a>
    </nav>
  </header>

  <main id="content" class="site-content" role="main">

    <section id="intro" class="full-screen pt-5 blue">
      <h1>A cool title</h1>

      <div id="clouds-layer-1" class="clouds"></div>
      <div id="clouds-layer-2" class="clouds"></div>
    </section>

    <section id="panels">

      <div id="panels-container" style="width: 500%;">
        <article id="panel-1" class="panel full-screen red">
          <div class="container">
            <div class="row">
              <div class="col-6">

                <img src="" alt="">

              </div>
              <div class="col-6 d-flex flex-column">

                <h2>Panel 1</h2>

                <p class="step-description">
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Including versions of Lorem Ipsum.
                </p>

                <div class="panels-navigation text-right">
                  <div class="nav-panel" data-sign="plus"><a href="#panel-2" class="anchor">Next</a></div>
                </div>
              </div>
            </div>
          </div>
        </article>
        <article id="panel-2" class="panel full-screen orange">
          <div class="container">
            <div class="row">
              <div class="col-6">

                <img src="" alt="">

              </div>
              <div class="col-6 d-flex flex-column">

                <h2>Panel 2</h2>

                <p class="step-description">
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Including versions of Lorem Ipsum.
                </p>

                <div class="panels-navigation">
                  <div class="nav-panel" data-sign="minus"><a href="#panel-1" class="anchor">Prev</a></div>
                  <div class="nav-panel" data-sign="plus"><a href="#panel-3" class="anchor">Next</a></div>
                </div>
              </div>
            </div>
          </div>
        </article>
        <article id="panel-3" class="panel full-screen purple">
          <div class="container">
            <div class="row">
              <div class="col-6">

                <img src="" alt="">

              </div>
              <div class="col-6 d-flex flex-column">

                <h2>Panel 3</h2>

                <p class="step-description">
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Including versions of Lorem Ipsum.
                </p>

                <div class="panels-navigation">
                  <div class="nav-panel" data-sign="minus"><a href="#panel-2" class="anchor">Prev</a></div>
                  <div class="nav-panel" data-sign="plus"><a href="#panel-4" class="anchor">Next</a></div>
                </div>
              </div>
            </div>
          </div>
        </article>
        <article id="panel-4" class="panel full-screen green">
          <div class="container">
            <div class="row">
              <div class="col-6">

                <img src="" alt="">

              </div>
              <div class="col-6 d-flex flex-column">

                <h2>Panel 4</h2>

                <p class="step-description">
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Including versions of Lorem Ipsum.
                </p>

                <div class="panels-navigation">
                  <div class="nav-panel" data-sign="minus"><a href="#panel-3" class="anchor">Prev</a></div>
                  <div class="nav-panel" data-sign="plus"><a href="#panel-5" class="anchor">Next</a></div>
                </div>
              </div>
            </div>
          </div>
        </article>
        <article id="panel-5" class="panel full-screen gray">
          <div class="container">
            <div class="row">
              <div class="col-6">

                <img src="" alt="">

              </div>
              <div class="col-6 d-flex flex-column">

                <h2>Panel 5</h2>

                <p class="step-description">
                  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Including versions of Lorem Ipsum.
                </p>

                <div class="panels-navigation text-right">
                  <div class="nav-panel" data-sign="minus"><a href="#panel-4" class="anchor">Prev</a></div>
                </div>
              </div>
            </div>
          </div>
        </article>
      </div>
    </section>

    <section id="map" class="full-screen"></section>

  </main>

</div>
!

CSS 

              
                /* Most of these styles could be removed but are for the demo to look better */

html,
body {
  margin: 0;
  height: 100%;
  font-weight: 300;
}
body {
  overflow-x: hidden;
}

a {
  color: white;
}

h1,
h2 {
  text-align: center;
}

.full-screen {
  display: block;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

#intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

#masthead {
  position: fixed;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  z-index: 9999;
}
#masthead a {
  padding: 1rem 2rem;
}


#panels #panels-container {
  height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: nowrap;
  flex-wrap: nowrap;
  padding: 0;
  overflow: hidden;
  background-color: #ddd;
}
#panels #panels-container .panel {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  color: #333;
  text-align: left;
  border-right: 1px solid #f00;
}
#panels #panels-container .panel img {
  max-width: 100%;
  height: auto;
  display: block;
}
#panels #panels-container .panel .panels-navigation {
  width: 100%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  justify-content: flex-end;
}
#panels #panels-container .panel .anchor-panel,
#panels #panels-container .panel .nav-panel {
  color: #000;
  text-transform: uppercase;
  margin-right: 2rem;
}
#panels #panels-container .panels-navigation {
  position: absolute;
  width: 100%;
  bottom: 2rem;
  right: 2rem;
}
!

JS 

              
                gsap.registerPlugin(ScrollToPlugin, ScrollTrigger);

/* Main navigation */
let panelsSection = document.querySelector("#panels"),
	panelsContainer = document.querySelector("#panels-container");

document.querySelectorAll(".anchor").forEach(anchor => {
	anchor.addEventListener("click", function(e) {
		e.preventDefault();
		let targetElem = document.querySelector(e.target.getAttribute("href")),
			y = targetElem;
		if (targetElem && panelsContainer.isSameNode(targetElem.parentElement)) {
			let totalScroll = tween.scrollTrigger.end - tween.scrollTrigger.start,
				totalMovement = (panels.length - 1) * targetElem.offsetWidth;
			y = Math.round(tween.scrollTrigger.start + (targetElem.offsetLeft / totalMovement) * totalScroll);
		}
		gsap.to(window, {
			scrollTo: {
				y: y,
				autoKill: false
			},
			duration: 1
		});
	});
});

/* Panels */
const panels = gsap.utils.toArray("#panels-container .panel");
let tween = gsap.to(panels, {
	xPercent: -100 * ( panels.length - 1 ),
	ease: "none",
	scrollTrigger: {
		trigger: "#panels-container",
		pin: true,
		start: "top top",
		scrub: 1,
		snap: {
			snapTo: 1 / (panels.length - 1),
			inertia: false,
			duration: {min: 0.1, max: 0.1}
		},
		end: () =>  "+=" + (panelsContainer.offsetWidth - innerWidth)
	}
});

panels.forEach((panel, index)=> {
  ScrollTrigger.create({
    trigger: panel,
    containerAnimation: tween,
    markers: true,
    start: 'left right',
    markers: true,
    onEnter: () => {console.log(panel.id)}
  })
})
!
999px

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