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CSS

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About CSS Base

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HTML 

              
                <a href="https://youtu.be/kd_zuEYCDck" target="_blank" data-keyframers-credit style="color: #000"></a>
<script src="https://codepen.io/shshaw/pen/QmZYMG.js"></script>

<input type="radio" name="scene" id="scene-1" value="1" checked />
<input type="radio" name="scene" id="scene-2" value="2" />
<input type="radio" name="scene" id="scene-3" value="3" />
<input type="radio" name="scene" id="scene-4" value="4" />

<main id="site">
  <header class="top-nav">
    @keyframers
  </header>
  <div class="ocean">
    <div class="ocean-text">Stop</div>
  </div>
  <div class="left-side">    
    <div class="page-numbers" data-total="04">
      <div class="page-number -tens">0</div>
      <div class="page-number -ones">
        1<br/>2<br/>3<br/>4
      </div>
    </div>
  </div>
  <div class="hero">
    <div class="layer" data-scene="1">      
      <h1 class="heading">
        We can help<br />
        to save<br />
        the oceans
      </h1>
      <button class="button">
        How can I help?
      </button>
    </div>
    <div class="layer" data-scene="2">      
      <h1 class="heading">
        Saving nature,<br />
        we save our<br />
        future
      </h1>
      <button class="button">
        How can I help?
      </button>
    </div>
    <div class="layer" data-scene="3">      
      <h1 class="heading">
        Only you<br />
        can prevent<br />
        ocean fires
      </h1>
      <button class="button">
        How can I help?
      </button>
    </div>
    <div class="layer" data-scene="4">      
      <h1 class="heading">
        Do not<br />
        litter on<br />
        the beach
      </h1>
      <button class="button">
        How can I help?
      </button>
    </div>
  </div>

  <div class="left-content">
    <div class="layer" data-scene="1">      
      <div class="fact subtitle">More than</div>
      <div class="fact number">1 000 000</div>
      <div class="fact description">seabirds die yearly due to plastic debris</div>
    </div>
    <div class="layer" data-scene="2">      
      <div class="fact subtitle">The largest garbage patch is</div>
      <div class="fact number">1 760 000 m<sup>2</sup></div>
      <div class="fact description">and is 10m deep</div>
    </div>
    <div class="layer" data-scene="3">      
      <div class="fact subtitle">More than</div>
      <div class="fact number">700 000</div>
      <div class="fact description">species call the ocean their home</div>
    </div>
    <div class="layer" data-scene="4">      
      <div class="fact subtitle">There is an estimated</div>
      <div class="fact number">12 000 000</div>
      <div class="fact description">metric tons of plastic in the ocean</div>
    </div>
  </div>
  <div class="right-content">

    <nav class="slide-nav">
      <div class="nav-button -prev">
        &lt;
      
        <label class="nav-toggle" for="scene-1">1</label>
        <label class="nav-toggle" for="scene-2">2</label>
        <label class="nav-toggle" for="scene-3">3</label>
        <label class="nav-toggle" for="scene-4">4</label>
       
      </div>
      <div class="nav-button -next">
        Next &gt;
      
        <label class="nav-toggle" for="scene-1">1</label>
        <label class="nav-toggle" for="scene-2">2</label>
        <label class="nav-toggle" for="scene-3">3</label>
        <label class="nav-toggle" for="scene-4">4</label>
      </div>
    </nav>

    <div class="layer" data-scene="1">      
      <h2 class="heading">
        It's not late. It's time to save the ocean.
      </h2>
      <p class="paragraph">
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Quae accusantium est autem amet minus, atque consequatur iure dolor id inventore sit magnam sint, voluptates deserunt beatae? Error eveniet quam dicta!
      </p>
    </div>

    <div class="layer" data-scene="2">      
      <h2 class="heading">
        Facts and Stats on Ocean Pollution
      </h2>
      <p class="paragraph">
        Lorem ipsum dolor, sit amet consectetur adipisicing elit. Inventore, amet hic provident ipsa placeat ad. Excepturi distinctio consectetur voluptatibus rem deleniti ducimus officia natus, magnam aut architecto sint reprehenderit provident?
      </p>
    </div>
    
    <div class="layer" data-scene="3">      
      <h2 class="heading">
        Learn more about how you can help.
      </h2>
      <p class="paragraph">
        Lorem ipsum dolor, sit amet consectetur adipisicing elit. Inventore, amet hic provident ipsa placeat ad. Excepturi distinctio consectetur voluptatibus rem deleniti ducimus officia natus, magnam aut architecto sint reprehenderit provident?
      </p>
    </div>
    
    <div class="layer" data-scene="4">      
      <h2 class="heading">
        Join the fight to defend our oceans.
      </h2>
      <p class="paragraph">
        Lorem ipsum dolor sit, amet consectetur adipisicing elit. Modi temporibus explicabo aspernatur dignissimos veritatis. Voluptate quis quia sed totam quasi placeat, odio quam fuga consectetur voluptatibus praesentium tempore vel molestiae?
      </p>
    </div>
  </div>
</main>
!

CSS 

              
                
@import url('https://fonts.googleapis.com/css?family=Raleway:400,800');
@import url('https://fonts.googleapis.com/css?family=Oswald:500');

$color-teal: #0D3D4D;

::selection {
  background-color: #2256A1;
  color: white;
}

#site {
  display: grid;
  grid-template-rows: 3fr 2fr;
  grid-template-columns: 4rem 1fr 1fr 5rem;
  width: 90vw;
  height: 90vh;
  box-shadow: 0 .5rem 2rem rgba(black, 0.1);
  background-color: #fff;
  color: #000;
  font-family: 'Raleway', sans-serif;
  overflow: hidden;

  * {
    transition: all .6s cubic-bezier(.2, 0, .2, 1);
  }
}

#site { 
  --total: 4; 
  --scene: 1;
  --percentage: calc(var(--scene) / var(--total));
}

input[name="scene"] { 
  position: absolute; 
  top: 0; 
  left: -100%; 
  visibility: hidden;
  z-index: 5; 
}
input[value="1"]:checked ~ #site { --scene: 1; }
input[value="2"]:checked ~ #site { --scene: 2; }
input[value="3"]:checked ~ #site { --scene: 3; }
input[value="4"]:checked ~ #site { --scene: 4; }

input[value="1"]:checked ~ * [data-scene]:not([data-scene="1"]),
input[value="2"]:checked ~ * [data-scene]:not([data-scene="2"]),
input[value="3"]:checked ~ * [data-scene]:not([data-scene="3"]),
input[value="4"]:checked ~ * [data-scene]:not([data-scene="4"]) {
  pointer-events: none;
  
  .heading, .paragraph, .fact {    
    transform: translateX(-25%);
    opacity: 0;
  }
}

input[value="1"]:checked ~ * [data-scene="1"],
input[value="2"]:checked ~ * [data-scene="2"],
input[value="3"]:checked ~ * [data-scene="3"],
input[value="4"]:checked ~ * [data-scene="4"] {
  + [data-scene] {
    .heading, .paragraph, .fact {
      transform: translateX(25%);
    }
  }
}

.ocean {
  grid-row: 1 / 2;
  grid-column: 1 / -1;
  background-color: blue;
  background-image: url(https://picsum.photos/1200/800?image=912);
  background-repeat: no-repeat;
  background-size: cover;
  overflow: hidden;
}

.ocean-text {
  display: inline-block;
  white-space: nowrap;
  font-size: 45vh;
  text-transform: uppercase;
  font-weight: bold;
  font-family: 'Raleway', sans-serif;
  position: relative;
  background-image: url(https://picsum.photos/1200/800?image=909);
  background-size: 160% auto;
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;

  background-position: calc( 25% + (-50% * var(--percentage)) ) 0;

  transform: 
    translateX( calc( 50% + ( -100% * var(--percentage) ) ) );
}

.left-content {
  float: left;
  grid-row: 2 / 4;
  grid-column: 2 / 3;

  .layer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;

    > .subtitle {
      font-weight: bold;
      color: $color-teal;
    }

    > .subtitle, > .description {
      font-size: .75rem;
    }

    > .subtitle, > .number {
      color: $color-teal;
    }

    > .number {
      font-size: 2rem;
      font-weight: bold;
      letter-spacing: -1px;
    }
  }

}

.right-content {
  grid-row: 2 / 4;
  grid-column: 3 / -1;

  > .layer {    
    padding: 3rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;

    > .heading {
      margin: 0;
      font-size: 1rem;
      color: $color-teal;
    }
  }
}

/* ---------------------------------- */

.slide-nav {
  position: absolute;
  bottom: 100%;
  right: 0;
  display: flex;
}


.nav-button {
  display: inline-block;
  padding: 0.5em 1em;
  background: #F9FBFB;
  cursor: pointer;
  user-select: none;
  font-weight: bold;
  text-transform: uppercase;
  overflow: hidden;
  color: #8CAAB7;
  
  &.-next {
    color: #2D4451;
    background: #CEDBE5; }

  .nav-toggle {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    opacity: 0;
    transform: translateX(0);
    transition: transform 0.5s linear 0s;
    z-index: 1;
  }
}

input[value="1"]:checked ~ * .-next .nav-toggle:not([for="scene-2"]),
input[value="2"]:checked ~ * .-next .nav-toggle:not([for="scene-3"]),
input[value="3"]:checked ~ * .-next .nav-toggle:not([for="scene-4"]),
input[value="4"]:checked ~ * .-next .nav-toggle:not([for="scene-1"]),
input[value="1"]:checked ~ * .-prev .nav-toggle:not([for="scene-4"]),
input[value="2"]:checked ~ * .-prev .nav-toggle:not([for="scene-1"]),
input[value="3"]:checked ~ * .-prev .nav-toggle:not([for="scene-2"]),
input[value="4"]:checked ~ * .-prev .nav-toggle:not([for="scene-3"]) {
  transform: translateX(100%);
  z-index: 3;
  transition-delay: .5s !important;
}

.top-nav {
  grid-column: 2 / 3;
  grid-row: 1 / 2;
  margin-top: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  z-index: 2;
  color: #FFF;
  font-weight: bold;
  text-shadow: 0 1px 1em rgba(0,0,0,0.4);
}

/* ---------------------------------- */

.left-side {
  grid-row: 1 / 2;
  grid-column: 2 / 3;
  // align-self: end;
  font-size: 4rem;
  font-family: 'Oswald', sans-serif;
  font-weight: 500;
  overflow: hidden;
}

.page-numbers {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 1em;
  width: 100%;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #FFF;
  transform: translateY(.5rem);

  &:after {
    content: '/ ' attr(data-total);
    font-size: 1rem;
    position: absolute;
    top: 0;
    left: 4.2rem;
    opacity: 0.7;
  }
}

.page-number {
  display: inline-block;

  &.-ones {
    transform: translateY(
      calc((var(--total) - var(--scene))
      * (100% / var(--total)))
      );
  }
}

.hero {
  grid-row: 1 / 2;
  grid-column: 3 / -1;
  color: #FFF;

  > .layer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
  }

  .heading {
    text-transform: uppercase;
    letter-spacing: 2px;
  }

  .button {
    appearance: none;
    border: none;
    padding: 1rem;
    background-color: $color-teal;
    color: white;
    font-size: .6rem;
    font-family: inherit;
  }
}


.layer {
  position: absolute;
  top: 0;
  left: 0;
  // this...
  bottom: 0;
  right: 0;
  // or this... (preferred)
  width: 100%;
  height: 100%;
  margin: auto;
}


// -------------------------------

*, *:before, *:after {
  box-sizing: border-box;
  position: relative;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
!

JS 

              
                // 🌊
!
999px

Console