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HTML 

              
                <nav class="nav">
  <div class="nav-wrapper" data-animate="nav-wrapper">
    <a class="nav__logo" href="#!" data-animate="split-word">Super company</a>
    <ul class="nav__menu animate-nav__menu">
      <li>
        <a class="nav__menu-item nav__menu-item--active" href="#!">What</a>
      </li>
      <li>
        <a class="nav__menu-item" href="#!">How</a>
      </li>
      <li>
        <a class="nav__menu-item" href="#!">About</a>
      </li>
      <li>
        <a class="nav__menu-item" href="#!">Contact</a>
      </li>
      <li>
        <button class="btn-signin" type="button">Sign in</button>
      </li>
    </ul>
  </div>
</nav>
<main class="main">
  <div class="wrapper-purple">
    <section class="purple">
      <div class="purple__bg" data-animate="purple__bg"></div>
      <figure class="purple__img shadow" data-animate="purple__img">
        <img src="https://raw.githubusercontent.com/ivanalbizu/landing-animation/main/src/img/purple__img.png" alt="">
      </figure>
      <article class="purple__txt" data-animate="purple__txt">
        <h1 class="purple-title">Lorem ipsum dolor sit.</h1>
        <p class="purple-subtitle">Lorem ipsum dolor sit amet consectetur adipisicing elit. Consequatur tempore corporis optio vitae nihil amet repellendus asperiores ipsam doloribus possimus.</p>
        <form onsubmit="event.preventDefault();">
          <div class="btn-subscribe">
            <label class="label" data-animate="label">
              <input type="text" class="text" placeholder="Your email">
              <span class="placeholder">Your email</span>
            </label>
            <button type="submit" class="submit" data-animate="submit">subscribe</button>
          </div>
        </form>
      </article>
    </section>
  </div>

  <div class="wrapper-green" data-content-visibility="false" style="--intrinsic-size:1px 700px;">
    <section class="green">
      <article class="green__txt" data-animate="green__txt">
        <h2 class="green-title">Lorem ipsum dolor sit amet consectetur adipisicing elit.</h2>
        <p class="green-subtitle">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Molestias, alias.</p>
        <form>
          <button type="button" class="btn-register">register</button>
        </form>
      </article>
      <div class="green__bg" data-animate="green__bg"></div>
      <figure class="green__img-left shadow" data-animate="green__img-left">
        <img src="https://raw.githubusercontent.com/ivanalbizu/landing-animation/main/src/img/green__img-01.jpg" alt="">
      </figure>
      <figure class="green__img-right shadow" data-animate="green__img-right">
        <img src="https://raw.githubusercontent.com/ivanalbizu/landing-animation/main/src/img/green__img-02.jpg" alt="">
      </figure>
    </section>
  </div>

  <div class="blue">
    <header class="blue__header">
      <h3 class="blue-title">Lorem ipsum dolor sit amet consectetur, adipisicing elit. Iusto, repellendus.</h3>
    </header>
    <div class="wrapper-blue wrapper-blue--top">
      <div class="blue__content">
        <div class="blue__content-left">
          <p class="blue-subtitle">Lorem ipsum dolor sit amet consectetur.</p>
          <div class="counter">
            <div class="counter__minute"><span></span></div>
            <div class="counter__separator">:</div>
            <div class="counter__second"><span></span></div>
          </div>
        </div>
        <div class="blue__content-right">
          <figure class="blue__img-top" data-animate="blue__img-top">
            <img src="https://raw.githubusercontent.com/ivanalbizu/landing-animation/main/src/img/linternas.jpg" alt="">
          </figure>
        </div>
      </div>
    </div>
    <div class="wrapper-blue wrapper-blue--bottom">
      <div class="blue__content">
        <div class="blue__content-left">
          <ul class="list" data-animate="list">
            <li class="list-item">
              <span class="list__title">First item Lorem ipsum dolor sit.</span>
              <span class="list__subtitle">Lorem ipsum dolor sit amet consectetur adipisicing elit. Rem blanditiis necessitatibus earum.</span>
            </li>
            <li class="list-item">
              <span class="list__title">Second item Lorem ipsum dolor sit more than one.</span>
              <span class="list__subtitle">Lorem ipsum dolor sit amet consectetur adipisicing elit. Rem blanditiis necessitatibus earum.</span>
            </li>
            <li class="list-item">
              <span class="list__title">Third item Lorem ipsum dolor.</span>
              <span class="list__subtitle">Lorem ipsum dolor sit amet. Rem blanditiis necessitatibus earum.</span>
            </li>
          </ul>
        </div>
        <div class="blue__content-right">
          <figure class="blue__img-bottom shadow-light">
            <img src="https://raw.githubusercontent.com/ivanalbizu/landing-animation/main/src/img/spider.png" data-animate="filter" alt="">
          </figure>
        </div>
      </div>
    </div>
  </div>

</main>

<footer class="footer">
  <div>This is a footer content</div>
</footer>
!

CSS 

              
                * {
  box-sizing: border-box;
  margin: 0;
}
html,
body {
  height: 100%;
}
body {
  font-family: 'Montserrat', sans-serif;
  color: #242424;
}
h1, h2, h3, h4, h5, h6, p {
  font-size: 1em;
  margin-block-start: 0;
  margin-block-end: 0;
  margin-inline-start: 0;
  margin-inline-end: 0;
  font-weight: 400;
}
figure {
  margin-block-start: 0;
  margin-block-end: 0;
  margin-inline-start: 0;
  margin-inline-end: 0;
  font-weight: 400;
  display: flex;
  img {
    max-width: 100%;
  }
}
ul {
  list-style-type: none;
  margin-block-start: 0;
  margin-block-end: 0;
  margin-inline-start: 0;
  margin-inline-end: 0;
  padding-inline-start: 0;
}
a, a:hover, a:visited {
  text-decoration: none;
}
input, button {
  font-family: 'Montserrat', sans-serif;
  font-weight: 400;
  border: 0;
  border-radius: 0;
  outline: none;
}
input[type="submit"], button {
  cursor: pointer;
}
::placeholder {
  color: transparent;
}

$breakpoint-desktop: 64em;
$breakpoint-tablet: 42.5em;
$breakpoint-mobile: 35.938em;

:root {
  --width-content: 86.252em;
  --color-purple: #70163C;
  --color-purple-light: #9C2A5A;
  --color-purple-dark: #2E0F15;
  --color-green: #307351;
  --color-green-light: #A8BBB2;
  --color-gray: #d6d6d6;
  --color-blue: #068d9d;
  --color-mustard: #e3b23c;
  --grid: 90px;
  --counter-legend-size: 24;
}

@supports (content-visibility: auto) {
  [data-content-visibility="false"] {
    content-visibility: auto;
    contain-intrinsic-size: var(--intrinsic-size);
  }
  [data-content-visibility="true"] {
    content-visibility: visible;
  }
}

.main {
  width: 100%;
  display: flex;
  flex-direction: column;
}
.wrapper-purple {
  background: var(--color-purple);
  background: linear-gradient(to bottom, var(--color-purple) 88%, var(--color-gray) 88%);
}
.wrapper-green {
  background-color: var(--color-gray);
}
.wrapper-blue {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
  }
  &--top {
    background: linear-gradient(to right, #fff calc(50% + 1px), var(--color-mustard) calc(50% + 1px));
    &::after {
      background: linear-gradient(to bottom, #fff 50%, var(--color-mustard) 50%);
    }
  }
  &--bottom {
    background-color: var(--color-blue);
    &::after {
      background-color: var(--color-mustard);
    }
  }
}

.nav {
  background-color: var(--color-purple);
  &-wrapper {
    width: min(100%, var(--width-content));
    padding-left: 1em;
    padding-right: 1em;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
    &::after {
      content: "";
      width: calc(100% - 2em);
      display: block;
      border-bottom: 1px solid #fff;
      position: absolute;
      bottom: 0;
    }
  }
  &__logo {
    color: #fff;
    font-family: 'Open Sans Condensed', sans-serif;
    font-size: 1.5em;
    letter-spacing: 1.5px;
    padding: .5em 0;
    margin-right: 2em;
  }
  &__menu {
    display: flex;
    align-items: center;
    overflow-x: auto;
    &-item {
      color: #fff;
      font-size: .9em;
      display: flex;
      align-items: center;
      border-top: 3px solid transparent;
      border-bottom: 3px solid transparent;
      padding: 1.5em 0;
      margin: auto 1em;
      &:hover,
      &--active {
        border-bottom: 3px solid #fff;
      }
      &:focus {
        outline: none;
      }
    }
    li {
      border-top: 4px solid transparent;
      white-space: nowrap;
      // simulate line under menu when break menu on responsive
      @media only screen and (hover: none) and (pointer: coarse) {
        &:not(:last-of-type) {
          border-bottom: 1px solid #fff;
        }
      }
      // keyboard focus style
      &:not(:last-of-type):focus-within {
        background-color: #fff;
        .nav__menu-item {
          color: var(--color-purple);
        }
      }
    }
  }
}
.purple {
  width: 100%;
  max-width: var(--width-content);
  padding: var(--grid) 1em 0;
  margin: auto;
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  grid-gap: 0;
  &__bg {
    grid-area: 2 / 1 / 10 / 8;
    background-color: var(--color-purple-light);
    clip-path: polygon(0 59%, 100% 59%, 100% 100%, 0% 100%);
  }
  &__img {
    grid-area: 2 / 2 / 8 / 7;
    justify-content: center;
    overflow: hidden;
    height: 586px;
    img {
      height: 100%;
      max-height: 750px;
      object-fit: cover;
      object-position: center;
      border-bottom: var(--grid) solid transparent;
      z-index: 1;
    }
  }
  &__txt { 
    grid-area: 3 / 9 / 5 / 16;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: #fff;
  }
}

.green {
  width: 100%;
  max-width: var(--width-content);
  padding: var(--grid) 1em;
  margin: auto;
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  grid-template-rows: repeat(11, 1fr);
  grid-gap: 0;
  &__txt {
    grid-area: 3 / 2 / 9 / 7;
    padding-right: 1em;
  }
  &__bg {
    grid-area: 1 / 7 / 10 / 15;
    background-color: var(--color-green-light);
  }
  &__img-left {
    grid-area: 3 / 8 / 12 / 12;
    justify-content: flex-start;
    align-self: flex-start;
    img {
      width: 96%;
    }
  }
  &__img-right {
    grid-area: 3 / 12 / 9 / 16;
    justify-content: flex-end;
    align-self: center;
    img {
      width: 94%;
    }
  }
}
.blue {
  padding-top: clamp(3em, 7vw, 8em);
  &__header {
    display: flex;
    justify-content: space-between;
    width: var(--width-content);
    max-width: 100%;
    padding: 0 1em;
    margin: auto;
  }
  &__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    width: var(--width-content);
    max-width: 100%;
    padding: 0 1em 0;
    margin: auto;
    &-left,
    &-right {
      width: 50%;
      z-index: 1;
    }
    &-left {
      padding: 0 2em 1em 0;
    }
    &-right {
      img {
        padding-left: 2em;
      }
    }
  }
  &__img-bottom {
    padding-top: 3em;
  }
}
.footer {
  height: 400px;
  background-color: var(--color-blue);
  padding-top: 3em;
  div {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    width: 100%;
    height: 100%;
    border-top: 1px solid #fff;
    font-size: 1.5em;
  }
}

// typos
.purple-title {
  color: #fff;
  font-family: 'Open Sans Condensed', sans-serif;
  font-size: clamp(1.8em, 6vw, 70px);
  font-weight: 300;
  letter-spacing: .2px;
  line-height: 1.2;
  margin-bottom: clamp(.3em, 2vw, .8em);
}
.purple-subtitle {
  color: #fff;
  font-size: clamp(.9em, 2vw, 1.1em);
  font-weight: 300;
  letter-spacing: .4px;
  line-height: 1.4;
  margin-bottom: clamp(2em, 2vw, 3em);
}
.green-title {
  color: #242424;
  font-family: 'Open Sans Condensed', sans-serif;
  font-size: clamp(1.5em, 5vw, 45px);
  font-weight: 300;
  letter-spacing: .2px;
  line-height: 1;
  margin-bottom: clamp(1em, 2vw, 2em);
}
.green-subtitle {
  color: #242424;
  font-size: clamp(.9em, 2vw, 1.1em);
  font-weight: 300;
  letter-spacing: .4px;
  line-height: 1.2;
  margin-bottom: clamp(2em, 2vw, 2.5em);
}
.blue-title {
  color: var(--color-blue);
  font-family: 'Open Sans Condensed', sans-serif;
  font-size: clamp(1.5em, 5vw, 50px);
  font-weight: 300;
  letter-spacing: .2px;
  line-height: 1;
  margin-bottom: clamp(1em, 2vw, 2em);
}
.blue-subtitle {
  color: var(--color-blue);
  font-size: clamp(.9em, 2vw, 1.1em);
  font-weight: 400;
  letter-spacing: .4px;
  line-height: 1.2;
  text-align: center;
  margin-bottom: clamp(2em, 2vw, 2.5em);
}

.list {
  color: #fff;
  &-item:not(:last-of-type) {
    margin-bottom: clamp(1.5em, 5vw, 5em);
  }
  li > span {
    display: flex;
  }
  &__title {
    font-family: 'Open Sans Condensed', sans-serif;
    font-size: clamp(1.5em, 4vw, 3em);
    line-height: 1;
    margin-bottom: .5em;
  }
  &__subtitle {
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(.9em, 2vw, 1.2em);
    line-height: 1.4;
  }
}

.btn-subscribe {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  input {
    background-color: transparent;
    color: #fff;
  }
  .label {
    flex: 0 0 55%;
    padding: 1em 0;
    border-bottom: 1px solid #fff;
    margin-bottom: .5em;
    position: relative;
    .text {
      letter-spacing: .8px;
      font-size: .9em;
      width: 100%;
      &:focus,
      &:not(:placeholder-shown) {
        + .placeholder {
          transform: translateY(-2em);
        }
      }
    }
    .placeholder {
      position: absolute;
      left: 2px;
      transition: all .1s ease;
    }
  }
  .submit {
    flex: 0 0 30%;
    font-size: 1em;
    letter-spacing: .4px;
    font-weight: 400;
    background-color: #fff;
    color: var(--color-purple);
    padding: 1em 3em;
    border: 2px solid transparent;
    margin-bottom: .5em;
    transition: all .3s linear .1s;
    &:focus,
    &:hover {
      color: #fff;
      background-color: var(--color-purple-light);
      border: 2px solid #fff;
      transition: all .4s linear .2s;
    }
  }

  @media (max-width: $breakpoint-mobile) {
    flex-direction: column;
    .label,
    .submit {
      flex: 1;
    }
    .submit {
      padding-top: .8em;
      padding-bottom: .8em;
    }
  }
}
.btn-signin {
  font-size: .9em;
  letter-spacing: .4px;
  font-weight: 300;
  background-color: darken(#70163C, 15%);
  color: #fff;
  padding: 1em 1.5em;
  margin-left: 2em;
  border: 2px solid transparent;
  &:focus,
  &:hover {
    background-color: rgba(0,0,0,.6);
    border: 2px solid #fff;
  }
}
.btn-register {
  font-size: 1em;
  letter-spacing: .4px;
  font-weight: 400;
  background-color: var(--color-green);
  color: #fff;
  padding: 1em 4em;
  border: 2px solid transparent;
  transition: all .3s linear .1s;
  &:focus,
  &:hover {
    color: var(--color-green);
    background-color: rgba(255,255,255,.3);
    border: 2px solid var(--color-green);
    transition: all .4s linear .2s;
  }
  @media (max-width: $breakpoint-mobile) {
    padding-top: .8em;
    padding-bottom: .8em;
    width: 100%;
  }
}
.shadow {
  filter: drop-shadow(0px 0px 3px rgba(0,0,0,.6));
}
.shadow-light {
  filter: drop-shadow(0px 0px 8px rgba(0,0,0,.4));
}

@media (max-width: $breakpoint-desktop) {
  .purple {
    display: flex;
    flex-wrap: wrap;
    background: var(--color-purple);
    padding-top: 2em;
    padding-bottom: 2.5em;
    position: relative;
    &__bg {
      width: calc(100% - 2em);
      height: 55%;
      position: absolute;
      top: 0;
    }
    &__img {
      img {
        width: 80%;
        margin-right: auto;
        height: auto;
        border-bottom-width: 20px;
      }
    }
  }
  .green {
    grid-template-columns: repeat(2, 5px) repeat(2, 1fr) repeat(2, 5px);
    grid-template-rows: 0 auto 10px auto 10px 0;
    grid-gap: 1em;
    padding-top: 2em;
    padding-bottom: 2em;
    &__txt {
      grid-area: 2 / 1 / 3 / 7;
      padding: 0 0 2em;
    }
    &__bg {
      grid-area: 3 / 2 / 6 / 5;
    }
    &__img-left {
      grid-area: 4 / 1 / 5 / 4;
    }
    &__img-right {
      grid-area: 4 / 4 / 5 / 7;
    }
    &__img-left,
    &__img-right {
      img {
        width: auto;
        max-width: 100%;
      }
    }
  }
}
@media (max-width: $breakpoint-tablet) {
  .purple {
    &__img {
      img {
        width: 100%;
      }
    }
  }
  .wrapper-blue {
    position: relative;
    &--top {
      //background: linear-gradient(to right, var(--color-blue) calc(50% + 1px), var(--color-mustard) calc(50% + 1px));
      &::after {
        left: 0;
      }
      .blue {
        &__content {
          &-right {
            padding-bottom: 1em;
          }
        }
      }
    }
    &--bottom {
      &::after {
        left: 36%;
      }
    }
  }
  .blue {
    &__content {
      &-left,
      &-right {
        width: 100%;
      }
      &-left {
        padding-right: 0;
      }
      &-right {
        img {
          padding-left: 0;
        }
      }
    }
    &__img-bottom {
      padding-top: 0;
      margin-top: -2.5em;
    }
  }
  .list {
    background-color: var(--color-blue);
    padding: 4em 2em 4em 0;
  }
}

// counter css
.counter {
  font-size: 3em;
  font-family: 'Open Sans Condensed';
  display: flex;
  justify-content: center;
  &__minute,
  &__second {
    width: 2ch;
    background-color: var(--color-blue);
    padding: .2em .4em;
    color: #fff;
    border-bottom: calc(var(--counter-legend-size) * 1px) solid rgba(255,255,255,1);
    box-sizing: content-box;
    position: relative;
    &::after {
      position: absolute;
      bottom: calc(var(--counter-legend-size) * -1px);
      left: 0;
      right: 0;
      color: var(--color-blue);
      font-size: calc(var(--counter-legend-size) * 1px);
      height: calc(var(--counter-legend-size) * 1px);
      line-height: 1;
      text-align: center;
    }
    span::before,
    span::after {
      text-shadow: 1px 1px 1px rgba(0,0,0,.8);
      animation-fill-mode: forwards;
      animation-iteration-count: infinite;
      animation-timing-function: step-end;
    }
  }
  &__minute {
    &::after {
      content: "min";
    }
  }
  &__second {
    &::after {
      content: "sec";
    }
  }
  &__separator {
    width: 1ch;
    color: var(--color-blue);
    padding: .2em 0;
    text-align: center;
  }
}

.counter__second span {
  &::before {
    counter-reset: second-unit-of-tens 5;
    content: counter(second-unit-of-tens);
    animation-duration: 60s;
    animation-name: counter-second-unit-of-tens;
  }
  &::after {
    counter-reset: second-unit 9;
    content: counter(second-unit);
    animation-duration: 10s;
    animation-name: counter-second-unit;
  }
}
@keyframes counter-second-unit {
  10%  { counter-increment: second-unit -1; }
  20%  { counter-increment: second-unit -2; }
  30%  { counter-increment: second-unit -3; }
  40%  { counter-increment: second-unit -4; }
  50%  { counter-increment: second-unit -5; }
  60%  { counter-increment: second-unit -6; }
  70%  { counter-increment: second-unit -7; }
  80%  { counter-increment: second-unit -8; }
  90%  { counter-increment: second-unit -9; }
  100% { counter-reset: second-unit 0; }
}
@keyframes counter-second-unit-of-tens {
  16.67% { counter-increment: second-unit-of-tens -1; }
  33.33% { counter-increment: second-unit-of-tens -2; }
  50.00% { counter-increment: second-unit-of-tens -3; }
  66.67% { counter-increment: second-unit-of-tens -4; }
  83.33% { counter-increment: second-unit-of-tens -5; }
  100%   { counter-reset: second-unit-of-tens 0; }
}

.counter__minute span {
  &::before {
    counter-reset: minute-unit-of-tens 5;
    content: counter(minute-unit-of-tens);
    animation-duration: 3600s;
    animation-name: counter-minute-unit-of-tens;
  }
  &::after {
    counter-reset: minute-unit 9;
    content: counter(minute-unit);
    animation-duration: 600s;
    animation-name: counter-minute-unit;
  }
}
@keyframes counter-minute-unit {
  10%  { counter-increment: minute-unit -1; }
  20%  { counter-increment: minute-unit -2; }
  30%  { counter-increment: minute-unit -3; }
  40%  { counter-increment: minute-unit -4; }
  50%  { counter-increment: minute-unit -5; }
  60%  { counter-increment: minute-unit -6; }
  70%  { counter-increment: minute-unit -7; }
  80%  { counter-increment: minute-unit -8; }
  90%  { counter-increment: minute-unit -9; }
  100% { counter-reset: minute-unit 0; }
}
@keyframes counter-minute-unit-of-tens {
  16.67% { counter-increment: minute-unit-of-tens -1; }
  33.33% { counter-increment: minute-unit-of-tens -2; }
  50.00% { counter-increment: minute-unit-of-tens -3; }
  66.67% { counter-increment: minute-unit-of-tens -4; }
  83.33% { counter-increment: minute-unit-of-tens -5; }
  100%   { counter-reset: minute-unit-of-tens 0; }
}


// ANIMATIONS
// ----------
// if data-animate exists, then set initial opacity to 0
// when its on viewport set opacity to 1
[data-animate] {
  opacity: 0;
  &[class*='animate-'] {
    opacity: 1;
  }
}

// Animate PURPLE section
.animate-split-word {
  [data-letter] {
    display: inline-flex;
    opacity: 0;
    transform: rotateY(0deg);
    animation: data-letter 2s ease-in calc(var(--global-index) * .2s) forwards;
  }
  [data-space="true"] {
    width: .8ch;
  }
}
@keyframes data-letter {
  0% {
    transform: rotateY(0deg);
  }
  60% {
    opacity: 1;
  }
  100% {
    transform: rotateY(1080deg);
    opacity: 1;
  }
}
.animate-nav-wrapper {
  &::after {
    width: 0;
    animation: nav-wrapper 1s linear 0s forwards;
  }
}
@keyframes nav-wrapper {
  0% { width: 0; }
  100% { width: calc(100% - 2em); }
}
.animate-nav__menu {
  position: relative;
  li {
    &::after {
      content: "";
      position: absolute;
      left: 0;
      top: 0;
      right: 0;
      bottom: 0;
      background-color: var(--color-purple);
      animation: nav__menu 1s ease 1s forwards;
    }
  }
}
@keyframes nav__menu {
  0% { height: 100%; }
  100% { height: 0; }
}
.animate-purple__bg {
  clip-path: polygon(0 0%, 100% 0%, 100% 0%, 0% 0%);
  animation: purple__bg 1.5s ease-in-out 2s forwards;
  @media (max-width: $breakpoint-desktop) {
    animation-delay: .2s;
  }
}
@keyframes purple__bg {
  0% { clip-path: polygon(0 0%, 100% 0%, 100% 0%, 0% 0%); }
  100% { clip-path: polygon(0 59%, 100% 59%, 100% 100%, 0% 100%); }
}
.animate-purple__img {
  position: relative;
  clip-path: polygon(0 0%, 100% 0%, 100% 0%, 0% 0%);
  animation: purple__img 3s ease-in-out 2s forwards;
  &::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 90px;
    width: 100%;
    height: calc(100% - 90px);
  }
  @media (max-width: $breakpoint-desktop) {
    animation-delay: .2s;
  }
}
@keyframes purple__img {
  0% { clip-path: polygon(0 0%, 100% 0%, 100% 0%, 0% 0%); }
  50% { clip-path: polygon(0 59%, 100% 59%, 100% 100%, 0% 100%); }
  100% { clip-path: polygon(0 0%, 100% 0%, 100% 100%, 0% 100%); }
}
.animate-purple__txt {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    background-color: var(--color-purple);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    animation: purple__txt 1s linear 1s forwards;
    @media (max-width: $breakpoint-desktop) {
      animation-delay: .2s;
    }
  }
}
@keyframes purple__txt {
  0% { clip-path: circle(140.9% at 100% 100%); }
  100% { clip-path: circle(0.0% at 100% 100%); }
}
.animate-label {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    background-color: var(--color-purple);
    left: 0;
    top: 0;
    right: 0;
    bottom: -1px;
    animation: label 1s linear 2s forwards;
    @media (max-width: $breakpoint-desktop) {
      animation-delay: 1.2s;
    }
  }
}
@keyframes label {
  0% {
    clip-path: polygon(0 0, 100% 0%, 100% 100%, 0% 100%);
    background-color: #fff;
  }
  100% {
    clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0% 100%);
  }
}
.animate-submit {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    background-color: var(--color-purple);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    animation: submit .5s linear 2.5s forwards;
    @media (max-width: $breakpoint-desktop) {
      animation-delay: 1.2s;
    }
  }
}
@keyframes submit {
  0% { clip-path: polygon(0 0, 100% 0%, 100% 100%, 0% 100%); }
  100% { clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0% 100%); }
}


// Animate GREEN section
.animate-green__txt {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    background-color: var(--color-gray);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    animation: green__txt 1s linear .5s forwards;
    @media (max-width: $breakpoint-desktop) {
      animation-delay: .2s;
    }
  }
}
@keyframes green__txt {
  0% { clip-path: circle(70.7% at 50% 50%); }
  100% { clip-path: circle(0% at 50% 50%); }
}
.animate-green__bg {
  clip-path: polygon(0 0, 0 0, 0 100%, 0 100%);
  animation: green__bg 1.5s cubic-bezier(0.51, 0.26, 0.82, 0.53) .3s forwards;
}
@keyframes green__bg {
  0% { clip-path: polygon(0 0, 0 0, 0 100%, 0 100%); }
  100% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%); }
}
.green__img-left,
.green__img-right {
  img {
    visibility: visible;
    opacity: 0;
  }
}
.animate-green__img-left {
  transform: translateY(-90px);
  visibility: hidden;
  animation: green__img-left 1s ease 2s forwards;
  img {
    opacity: 1;
    transition: opacity 1s linear 2s;
  }
}
@keyframes green__img-left {
  0% {
    transform: translateY(-90px);
    visibility: visible;
  }
  100% {
    transform: translateY(0);
    visibility: visible;
  }
}
.animate-green__img-right {
  transform: translateX(-120px);
  visibility: hidden;
  animation: green__img-right 1s ease 2.3s forwards;
  img {
    opacity: 1;
    transition: opacity 1s linear 2.3s;
  }
}
@keyframes green__img-right {
  0% {
    transform: translateX(-120px);
    visibility: visible;
  }
  100% {
    transform: translateX(0);
    visibility: visible;
  }
}

// Animate BLUE section
.animate-blue__img-top {
  position: relative;
  &::after {
    content: "";
    position: absolute;
    background: linear-gradient(to bottom, #fff 50%, var(--color-mustard) 50%);
    left: 2em;
    top: 0;
    right: 0;
    bottom: 0;
    animation: blue__img-top 1s linear .5s forwards;
  }
  filter: drop-shadow(0px 0px 8px rgba(0,0,0,.4));
  transition: filter .3s linear 1.5s;
  @media (max-width: $breakpoint-tablet) {
    &::after {
      left: 0;
    }
  }
}
@keyframes blue__img-top {
  0% { clip-path: circle(70.7% at 50% 50%); }
  100% { clip-path: circle(0% at 50% 50%); }
}
.list {
  .list-item {
    transform: translateX(2em);
    opacity: 0;
  }
}
.animate-list {
  .list-item {
    transform: translateX(2em);
    animation: list .5s ease .1s forwards;
    &:nth-child(2) {
      animation-delay: .6s;
    }
    &:nth-child(3) {
      animation-delay: 1.2s;
    }
  }
}
@keyframes list {
  0% {
    transform: translateX(2em);
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}
.animate-filter {
  animation: filter-blur 2s linear 0s forwards, filter-hue 15s linear 2s alternate infinite;
}
@keyframes filter-hue {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}
@keyframes filter-blur {
  0% { filter: blur(30px); }
  100% { filter: blur(0); }
}
!

JS 

              
                document.addEventListener('DOMContentLoaded', () => {

  if (CSS.supports('content-visibility', 'auto')) {
    const blocks = document.querySelectorAll('[data-content-visibility]')

    const io = new IntersectionObserver(ioHandlerContentVisibility);

    [].forEach.call(blocks, block => io.observe(block))

  }

  let splits = document.querySelectorAll('[data-animate="split-word"]');

  splits.forEach(split => {
    let splitTextContent = split.textContent;

    split.innerHTML = '';
    split.appendChild(sliptWords(splitTextContent))
  })

  const dataAnimates = document.querySelectorAll("[data-animate]")
  const ioAnimate = new IntersectionObserver(ioHandlerAnimate, ioConfigAnimate);

  [].forEach.call(dataAnimates, dataAnimate => ioAnimate.observe(dataAnimate))
})

const ioHandlerContentVisibility = (entries, self) => {
  for (let entry of entries) {
    if (entry.isIntersecting) {
      entry.target.setAttribute('data-content-visibility', 'true')
      self.unobserve(entry.target)
    }
  }
}

const ioHandlerAnimate = (entries, self) => {
  for (let entry of entries) {
    const target = entry.target
    if (entry.intersectionRatio > .2) {
      target.classList.add(`animate-${target.getAttribute("data-animate")}`)
      self.unobserve(target);
    }
  }
}

const ioConfigAnimate = {
  threshold: .2
}


const elFactory = (type, attributes, ...children) => {
  const el = document.createElement(type)

  for (key in attributes) {
    el.setAttribute(key, attributes[key])
  }

  children.forEach(child => {
    if (typeof child === 'string') el.appendChild(document.createTextNode(child))
    else el.appendChild(child)
  })

  return el
}

const sliptWords = words => {
  const fragment = new DocumentFragment();
  let globalIndex = 0;

  words.split(' ').forEach((word, iWord) => {
    const fragmentLetter = new DocumentFragment();

    word.split('').forEach((letter, iLetter) => {
      globalIndex++;
      const el = elFactory(
        'span',
        {
          'data-letter': `${letter}`,
          class: `letter`,
          style: `--letter-index:${iLetter+1}; --global-index: ${globalIndex};`
        },
        `${letter}`
      )
      fragmentLetter.appendChild(el);
    })

    const space = elFactory(
      'span',
      {
        'data-space': true,
        class: `space`
      },
      ` `
    )
    fragmentLetter.appendChild(space);

    const el = elFactory(
      'span',
      {
        'data-word': `${word}`,
        class: `word`,
        style: `--word-index:${iWord+1}`
      },
      fragmentLetter
    )
    fragment.appendChild(el);
  })

  return fragment;
}
!
999px

Console